Question

A converging lens forms a real image I on its optical axis. A rectangular glass slab of refractive index m and thickness t is introduced between the lens and I. I will move –

• A. Away from the lens by t(m – 1)
• B. Towards the lens by t(m – 1)
• C. Away from the lens by t(1 – 1/m)
• D. Towards the lens by t(1 – 1/m)

Answer 1

Answer: (C)

Away from the lens by t(1 – 1/m)

Answer 2

Rays coming from the lens formed the image at I initially due to refraction in the slab, the rays would move as shown and form the image at I'