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Aperture of a spherical mirror is 20 cm,...

Aperture of a spherical mirror is 20 cm, then circumference of this spherical mirror will be

A

3.14 cm

B

6.28 cm

C

20 cm

D

62.8 cm

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
Diameter of spherical mirror
2r
`therefore 20=2r`
`therefore` r=10 cm
`therefore` Circumference =2r
=`2xx3.14xx10`
=62.8 cm
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-D (MULTIPLE CHOICE QUESTIONS (MCQs))(MCQs FROM .DARPAN. BASED ON TEXTBOOK)
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  2. Aperture of a spherical mirror is 20 cm, then circumference of this sp...

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  3. Radius of curvature of a concave mirror is 20 cm, then its focal lengt...

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  4. No. of images obtained by combination of two plane mirrors kept perpen...

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  5. The number of images formed between two parallel plane mirrors are ......

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  6. To get three images of a single object, one should have two plane mirr...

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  7. A ray is incident at an angle 38^@ with a mirror. The angle between no...

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  8. If a ray of light is incident on a plane mirror at an angle of 30^@, t...

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  9. An object is placed at a distance of 25 cm on the axis of a concave mi...

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  10. For a thin convex lens when the heights of the object is double than i...

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  11. A point object O is placed midway between on the common axis of two co...

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  12. For ..... mirror, height of image is always ...... than height of obje...

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  13. An object is placed at a distance 40 cm in front of concave mirror. Fo...

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  14. A convex mirror having focal length 20 cm is used as side glass in car...

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  15. In which of the following mirrors can a person not see a reflection la...

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  16. Object is placed 60 cm away from convex mirror. If magnification is 0....

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  17. Lateral magnification of an object by spherical mirror is 0.3. If foca...

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  18. Plane mirror is moving towards you at 5 cm//s. You can see your image ...

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  19. PQ type incident radiation and RS is the reflected ray. They are both ...

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  20. Focal length of concave mirror is f and ratio of heights of object to ...

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