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While a moving picture is being screened...

While a moving picture is being screened, a boy introduced a glass slab of thickness 3 cm and refractive index 1.5 between the projector and the screen. In order to have a clear picture on the screen the screen should be moved through a distance of

A

1 cm away

B

1 cm nearer

C

2 cm away

D

3 cm away

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The correct Answer is:
A
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - A) Objective Type Questions (One option is correct)
  1. The radii of curvatures of a convex lens are 0.04 m and 0.04m. Its ref...

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  2. For a plano convex lens, the radius of curvature of convex surface is ...

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  3. A convex glass lens (mu(g) = 1.5) has a focal length of 8 cm when plac...

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  4. A light ray is incident normally on one of the refracting faces of a p...

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  5. If a light ray incidents normally on one of the faces of the prism of ...

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  6. A ray of light is incident on one of the faces of the angle prism with...

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  7. A prism of refractive index sqrt(2) has a refracting angle of 60^(@). ...

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  8. The least angle of deviation for a glass prism is equal to its refract...

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  9. A light ray of angles of incidence 40^(@) emerged from the prism in mi...

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  10. The angle of minimum deviation for a 75^(@) prism of dense glass is fo...

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  11. Suppose a small angled prism of 6^(@) deviates a ray through 3^(@), th...

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  12. A crown glass prism of angle of 5^@ is to be combined with a flint gla...

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  13. A thin prism of angle 6^(@) made up of glass of refractive index 1.5 i...

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  14. Compare the dispersive powers of two prisms if one of them deviates th...

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  15. A convex mirror forms an image one-fourth the size of the object. If o...

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  16. A microscope is focussed on the scratch at the bottom of a beaker. Wat...

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  17. While a moving picture is being screened, a boy introduced a glass sla...

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  18. A travelling microscope is focussed on to a scratch on the bottom of a...

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  19. In optical fibre, refractive index of inner part is 1.68 and refractiv...

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  20. A fish looking up through the water sees the outside world contained i...

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