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Q.

A converging lens of focal length 20 cm and a diverging lens of focal length 5 cm are placed coaxially at ‘d’ distance apart. If a parallel ray of light is incident on the converging lens and it emerges out of the diverging lens as a parallel ray, then the value of d will be

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a

50 cm

b

25 cm

c

15 cm

d

30 cm

answer is C.

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Detailed Solution

For parallel rays coming in and going out, net focal length of combination = 0

Hence, $\frac{1}{20} - \frac{1}{5} - \frac{d}{20 \times (- 5)} = 0 d = 15 c m$

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A converging lens of focal length 20 cm and a diverging lens of focal length 5 cm are placed coaxially at ‘d’ distance apart. If a parallel ray of light is incident on the converging lens and it emerges out of the diverging lens as a parallel ray, then the value of d will be