A lens forms a sharp image on a screen. On inserting a parallel sided glass slab between…
Physics · JEE Main · NTA Exams — Optics
A lens forms a sharp image on a screen. On inserting a parallel sided glass slab between the lens and the screen, it is found necessary to move the screen a distance d away from the lens in order for the image to be sharp again. If the refractive index of the glass relative to air is µ, then the thickness of the slab is
- µd
- d/µ
- (µ – 1) d/µ
- µ d/(µ – 1)
Answer
(D) µ d/( µ – 1)
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