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The radii of curvature of two spherical ...

The radii of curvature of two spherical surfaces of a concave convex lens `(mu=1.5)` are 20 cm and 40 cm. (i) What is its focal length when it is in air? Also find its focal length when it is immersed in a liquid of refractive index (ii) `mu=1.2` (iii) `mu=2`

A

(80 cm, 160 cm, -160 cm)

B

(80 cm, 80 cm, -80 cm)

C

(160 cm, 80 cm, 80 cm)

D

(80 cm, 160 cm, 160 cm)

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-GEOMETRICAL OPTICS-ADDITIONAL PRACTICE EXERCISE (LEVEL-II LECTURE SHEET(ADVANCED) STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  17. A point object O is placed at a distance of 0.3m from a convex lens (f...

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  18. A small object stuck on the surface of a glass sphere (n=1.5) is viewe...

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