JEE Advanced 2015 Paper 1 Physics Q8

Physics · Ray Optics: Reflection & Mirrors · Ray Optics: Refraction & Lenses

Problem

Consider a concave mirror and a convex lens (refractive index

=1.5

) of focal length

10\,\mathrm{cm}

each, separated by a distance of

50\,\mathrm{cm}

in air (refractive index

=1

) as shown in the figure. An object is placed at a distance of

15\,\mathrm{cm}

from the mirror. Its erect image formed by this combination has magnification

M_1

. When the set-up is kept in a medium of refractive index

7/6

, the magnification becomes

M_2

. The magnitude

M_2/M_1