Question

Focal length of converging lens is 20 cm,
S = 80 cm & d =100 cm. Find the position coordinate of final image after one refraction & one reflection at mirror –

• A. 3.16 cm
• B. 8.23 cm
• C. 10.53 cm
• D. 1.16 cm

Answer 1

Answer: (A)

3.16 cm

Answer 2

In parabolic mirror, parallel incident ray converge at focus y² = $\frac { x } { 8 }$ Here f= $\frac { 1 } { 32 }$ m

\ Image will formed at $\frac { 1 } { 32 }$m or 3.16 cm