Question

a converging lens is made of material having refractive index 1.3 how will it behave
if it is dipped in a liquid having refractive index 1.4​

Answer 1

Answer:

Diverging lense

Explanation:

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Answer 2

Answer:

It will behave as a converging lens.

Explanation:

Considering the lens to be an equi-convex lens, use the formula

1/f = (μ - 1 )(1/R₁ - 1/R₂)

R₁ = R₂= R

1/f = 1.3-1)(1/R - 1/R)

f = 5R/3,

When the lens is dipped in a liquid having a refractive index of 1.4, then

we will calculate the f of liquid, and we get this by using the above formula = -2R/14 = -7R

Now, f total will be equal to 1/f₁ + 1/f₂ = 16R/35 ,

f total is greater than zero so, the lens will behave as a converging lens.