Question 222: Ray Optics

Question

What is the position and nature of image formed by lens combination shown in figure ? (f1, f2 are focal lengths)

Accepted Answer

For first lens
$${1 \over V} - {1 \over { - 20}} = {1 \over 5}$$
V $$=$$ $${{20} \over 3}$$
For second lens
V = $${{20} \over 3}$$ $$-$$ 2 $$=$$ $${{14} \over 3}$$
$${1 \over V} - {1 \over {{{14} \over 3}}} = {1 \over { - 5}}$$
V $$=$$ 70cm

Answer

$${{20} \over 3}$$  cm from point B at right, real

Answer

70 cm from point B at right ; real

Answer

40 cm from point B at right; real

Answer

70 cm from point B at left ; virtual

Ray Optics

What is the position and nature of image formed by lens combination shown in figure ? (f1, f2 are focal lengths)

Choose the correct answer: