Question

In the given figure a Plane concave lens is placed on paper on which a flower is drawn. How far above its actual position does the flower appear to be?

• A. $10cm$
• B. $15cm$
• C. $50cm$
• D. none of these

Answer 1

The correct option is A $10cm$

Since apparent shift = $t(\mu -1)$

here t is thickness of glass slab $\mu$ is Refractive index of glass

hence $\delta =20(3/2-1)$

$\delta =10cm$