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A student has obtained a point image of ...

A student has obtained a point image of a distant object using a convex lens. To find the focal length of the convex lens, he should measure the distance between the :

A

Convex lens and the object

B

Convex lens and the screen

C

Object and the screen

D

Convex lens and the object and also between the object and the screen

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The correct Answer is:
B
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ZEN PUBLICATION-LIGHT - REFLECTION AND REFRACTION-ZEN ADDITIONAL QUESTIONS SECTION (MULTIPLE - CHOICE QUESTIONS)
  1. The power of a concave lens of focal length 50 cm is :

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  2. u, v, f and r represents the object distance, image distance, focal le...

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  3. When light goes from one medium to another, the characteristics that r...

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  4. Reflective index of glass with respect to air is 3/2. What is the refr...

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  5. When a light ray travels from one medium to another with the same refr...

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  6. The relation between refractive index of a medium (mu) in terms of vel...

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  7. The bending of a light ray due to change in velocity of light as the m...

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  8. To form an image twice the size of the object, using a convex lens of ...

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  9. The combination of a convex lens and a concave lens each of focal leng...

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  10. A dentist uses a concave mirror to examine the teeth. The position of ...

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  11. In the figure, AB is an object of height 2 cm. The position and height...

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  12. Concave mirrors are used as reflectors in the headlights of vehicles, ...

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  13. Which of these is true about the value of linear magnification (|m|) o...

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  14. The refractive index of a given pair of media is independent on which ...

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  15. A student has obtained a point image of a distant object using a conve...

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  16. In the incomplete ray diagram given below, the object AB would be at t...

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  17. Two lenses of power +3.5 D and - 2.5 D are placed in contact. The lens...

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  18. To obtain a diminished image of an object from a concave mirror, posit...

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  19. Identify the emergent ray in the given figure

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  20. An object is kept at the centre of curvature of a concave mirror. The ...

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