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To divide segment AB in the ratio 3:5, r...

To divide segment AB in the ratio 3:5, ray AX is drawn such that `angleBAX` is an acute angle. Then, the number of points to be marked at equal distance on AX must be at least ....

A

3

B

5

C

8

D

15

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The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 2.5cm for a grown up person. A perosn can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around 25cm. A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image o the spectacle lens becomes object for the eye lens and whose image is formed on the retina. The number of spectacle lens used for th eremedy of eye defect is decided by the power fo the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is +3D (converging lens of focal length 100//3cm ), then number of lens will be +3 . For all the calculations required, you can use the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens. Q. Maximum focal length of a eye lens of a normal person is

KUMAR PRAKASHAN-CONSTRUCTIONS -OBJECTIVE QUESTIONS
  1. The two tangents drawn to a circle at the end points of a diameter are...

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  2. If two radit of a circle are inclined to each other at an angle of 70^...

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  3. To divide segment AB in the ratio 3:5, ray AX is drawn such that angle...

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  4. To construct a triangle similar to A ABC using a scale factor (3)/(7),...

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  5. Point P lies on segment AB such that (AP)/(AB) = (2)/(5). Then, point ...

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  6. A segment AB is divided at a point P such that 7PB = 3AB. Then, the ra...

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  7. To divide a line segment internally in the ratio 4:7, the number of ar...

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  8. To draw two tangents to a circle which are inclined at an angle of 60°...

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  9. To draw two tangents to a circle which are perpendicular to each other...

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  10. If two tangents to a circle are inclined at an angle of 35^(@), the ra...

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  11. To draw two tangents to a circle with centre O and radius 3 cm from a ...

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  12. If two tangents to a circle are inclined at an angle of 75^(@), then t...

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  13. Point P lies in the exterior of a circle with cnetre O and radius 5 cm...

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  14. Point P lies on segment AB such that (AP)/(AB) = (3)/(8). In what rati...

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  15. If two tangents from point P to a circle are inclined to each other a...

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  16. Point P lies on segment AB such that 3 AB = 10 AP. In which ratio doe...

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  17. If a triangle is to be constructed similar to a given triangle ABC wit...

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  18. It is possible to divide a line segment in the ratio sqrt5 : (1)/(sqrt...

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  19. It is possible to divide a line segment in the ratio 2 + sqrt3 : 2- sq...

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  20. Check weather statement is true or False : A pair of tangents can be c...

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