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A concave mirror and a convex lens are o...

A concave mirror and a convex lens are of the same focal length in air. When they are immersed in water

A

The concave mirror will have its focal length increased

B

The convex lens will have its focal length increased

C

They will have equal focal lengths, defferent from those in air

D

They will have equal focal lengths, same as those in the air

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The correct Answer is:
B
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RESNICK AND HALLIDAY-GEOMETRICAL OPTICS : REFRACTION-Practice questions(single correct choice type)
  1. A point source of light is placed at a distance of 2f from a convergin...

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  2. A converging lens can from a virtual image if the object is placed

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  3. A concave mirror and a convex lens are of the same focal length in air...

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  4. A section of a spherical shell of outer radius R(0) and inner radius R...

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  5. A concave lens of glass, refractive index 1.5 has both surfaces of sam...

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  6. When an object is at a distance u(1) and u(2) from the optical centre ...

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  7. A concavo-convex glass (index=1.5) lens has radii of curvatures 60cm a...

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  8. Angle of minimum deviation is equal to the angle of prism A of an equi...

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  9. A ray of light passes through an equilateral prism such that the angle...

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  10. The critical angle for glass to air refraction is least for which colo...

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  11. A prism is made of glass which has a higher index of refraction for vi...

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  12. The focal lengths of a convex lens for blue and red colors of light ar...

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  13. A secondary rainbow is formed when light rays coming from the Sun unde...

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  14. The dispersive powers of two lenses are 0.01 and 0.02 . If focal lengt...

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  15. Focal lengths of two lenses are f and f' and dispersive powers of thei...

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  16. The table lists the index of refraction for various substances at 20^(...

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  17. What is the frequency of light that has a wavelength in water of 6.00x...

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  18. Blue light with a wavelength of 425 nm passes from a vacuum into a gla...

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  19. A child is looking at a reflection of the Sun in a pool of water. When...

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  20. A ray of light originating in oil (n=1.21) is incident at the Brewster...

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