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Q.

Figure A shows two identical plano convex lenses in contact as shown. The combination has focal length 24 cm. Figure B shows the same with a liquid introduced between them. If refractive index of glass of the lenses is 1.50 and that of the liquid is 1.60, the focal length of the system figure B will be

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a

$24 c m$

b

$- 24 c m$

c

$- 120 c m$

d

$120 c m$

answer is A.

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Detailed Solution

$\frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}} + \frac{1}{f_{3}}$

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