29 A 29 B 29 C 30 A 30 B

Lakhmir Singh & Manjit Kaur - Physics

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Q. 29 C

A combination of

Class 10th Lakhmir Singh & Manjit Kaur - Physics 5. Refraction of Light

Answer :

Focal length of 1 lens = 20 cm = 0.2 m

Power 1 = 1/ 0.2 = +5 D

Focal length of 2^nd lens = 40 cm = 0.4 m

Power 2 = 1/ 0.4 = 0.25 D

Power = P1 + P2 = +5D + 0.25 D = + 5.25 D ;

P = 1/f

f = + 18.18 cm

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