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Posted by Rahul Chaudhary 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Good Day 4 years, 11 months ago

Focal length of concave mirror is negative. f=−20cm u=−50cm We know that : f1=v1−u1 −201=v1−−501 v=−14.3cm. The image is virtual, erect.

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Sneha Jaiswal Jaiswal 4 years, 11 months ago

Given f= - 20 cm u= - 50 cm v= ? By using lens formula 1/f = 1/v - 1/u 1/-20 =1/v - 1/-50 1/-20= 1/v + 1/ 50 1/-20 - 1/50 =1/v -75 - 10/150 =1/v -85/150 = 1/v -17/30 = 1/v v = -30/17 v = -1.76

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