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Mirror Formula and Magnification

91.A convex g...

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91.A convex glass lens (μ = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water (μ = 4/3)? 1) 32 cm 2) 6 cm 3) 16 cm 4) 30 cm

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Q. A convex glass lens

(μ_{g} = 1.5)

has a focal length of 8 cm when placed in air. What is the focal length lens when it is immersed in water?

(μ_{ω} = \frac{4}{3})

Q. A double convex lens

(μ = 1.5)

in air has its focal length equal to

20 c m

. When immersed in water

(μ = 4 / 3)

its focal length will be

Q. A thin lens of refractive index 1.5 has a focal length of 15 cm in air. When the lens is placed in a medium of refractive index 4/3, its focal length will become

Q. Assertion :A double convex lens

(μ = 1.5)

has focal length 10 cm. When immersed in water

(μ = 4 / 3)

,its focal length becomes 40 cm. Reason:

\frac{1}{f} = \frac{μ_{l} - μ_{m}}{μ_{m}} (\frac{1}{R_{1}} - \frac{1}{R_{2}})

Q. A convex lens of refractive index

1.5

has a focal length of

18 c m

in air. Calculate its focal length when it is immersed in water of refractive index

\frac{4}{3} . t a k e f_{1} = 18

.

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