Question

For a biconvex lens, as shown in Fig. 1, calculate the image distance l’.

Answer 1

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Answer 2

answer:

Answer

(A)-p , r (B) -r,s (C) -p (D) -r,s

Solution

(A) when object is at focus , image is also real from equi- biconvex lens. <br>

<br> For equi biconvex

<br> Hence final image position v decreases <br> hence

also decrease <br> (B) From (i) R

<br> Radius of curvature increases i.e., now the object is not placed at focus and it is case when object is between focus and optical centre. Hence image formation is virtual. <br> (C) Glass slab provides shift of the object in the incident ray direction. so for lens object position becomes between focus and optical centre. <br> (D) When medium is changed then relative.