A double convex lens (n = 1 5 )in air has its focal length equal to 10 cm When - Science - Light - Reflection and Refraction

Question

A double convex lens (n = 1 5 )in air has its focal length equal
to 10 cm When immersed in water (n = 4/3 ) its focal length will
be
1 40/3 cm
2 7 5 cm
3 40 cm
4 Infinity

Shubham Ojha · Answer

focal length=R/2
so i think focal length is a constant quantity if we place the
lens in water then its focal length doesnt change because radius of
curvature is constant
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btw aap ye question kis book se laye hain?????
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A double convex lens (n = 1.5 )in air has its focal length equal to 10 cm. When immersed in water (n = 4/3 ) its focal length will be 1. 40/3 cm 2. 7.5 cm 3. 40 cm 4. Infinity

A double convex lens (n = 1.5 )in air has its focal length equal to 10 cm. When immersed in water (n = 4/3 ) its focal length will be

1. 40/3 cm

2. 7.5 cm

3. 40 cm

4. Infinity