Physics, asked by himawari40291, 5 hours ago

A converging lens of focal length 20cm is placed in contact with a diverging lens of focal length 30cm

Answers

Answered by chhandamishracm

0

Answer:

Correct option is

C

15cm

Given,

Focal length of converging lens, f1=20 cm

Focal length of diverging lens,f2=−5 cm

feq=f1+f2−df1f2

Since there is no deviation,

feq=∞

⇒f1+f2−d=0

⇒f1+f2=d

20−5=d

⇒d=15 cm

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