JEE Main 2016PhysicsRay OpticsMediumMCQ

JEE Main 2016Ray Optics Question with Solution

JEE Main 2016 (09 Apr Online)

Question

To find the focal length of a convex mirror, a student records the following data:
Object pin Convex Lens Convex Mirror Image Pin
22.2 cm 32.2 cm 45.8 cm 71.2 cm
The focal length of the convex lens is f1 and that of mirror is f2 . Then taking index correction to be negligibly small, f1 and f2 are close to:

Choose an option

Show full solutionCorrect option: A
Correct answer
Af1=7.8 cm f2=12.7 cm

Step-by-step explanation

Take f2=12.7

1f=1v+1u

112.7=125.4+1u

112.7=125.4=1u

u=25.4=v

1f=1v-1u

1f1=125.4+13.6+110

1f1=139+110

1f1=39049=7.96

The closest answers is (1) as option (3) and (4) are not possible.

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Ray Optics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2016, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.