BITSAT 2020 | Ray Optics Question 11 | Physics

A thin equi-convex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m. If it acts as a concave lens of focal length 0.5 cm when dipped in a liquid, the refractive index of the liquid is

$${{17} \over 8}$$

$${{15} \over 8}$$

$${{13} \over 8}$$

$${{9} \over 8}$$

BITSAT 2020

MCQ (Single Correct Answer)

-1

A spherical lens of power $$-$$4D is placed at a distance of 15 cm from another spherical lens of power 5 D. A beam of parallel light falls on the first spherical lens. The final image formed is

real and at a distance of 40 cm from the lens of power 5 D

real and at a distance of 10 cm from the lens of power $$-$$4 D

virtual and at a distance of 40 cm from the lens of power $$-$$5 D

None of the above

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