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A thin convex lens of focal length f made of crown glass is immersed in a liquid of refractive index _I ( _I> _c ) , where _c is the refractive index of the crown glass. The convex lens now is

Options

  1. Aa convex lens of longer focal length
  2. Ba convex lens of shorter focal length
  3. Ca divergent lens
  4. Da convex lens of focal length ( _c- ₁ f

Correct answer

C. a divergent lens

Step-by-step solution

When the convex lens of focal length f made of crown glass immersed in liquid of refractive index _f ( _l> _c ) , here _c is the refractive index of crown glass, thus from lens maker's formula, we will get focal length of the lens as negative ( _e>u_c ) . Therefore, the convex lens will behave like a concave lens. So, it will be a divergent lens.

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