Why does a convex lens of glass `mu = 1.5` behave as a diverging lens when immersed in carbon disulphide of `mu = 1.65` ?

Why does a convex lens of glass mu=1.5 behave as a diverging lens when immersed in carbon disulphide of higher refractive index mu=1.65 ?

Assertion : A convex lens of glass (mu = 1.5) behave as a diverging lens when immersed in carbon disulphinde of higher refractive index (mu = 1.65) . Reason : A diverging lens is thinner in the middle and thicker at the edges.

Assertion : A convex lens of glass (mu = 1.5) behave as a diverging lens when immersed in carbon disulphinde of higher refractive index (mu = 1.65) . Reason : A diverging lens is thinner in the middle and thicker at the edges.

A convex lens of crown glass (n =1.525) will behave as a divergent lens if immersed in

STATEMENT- 1 A convex lens of focal length (f=1.5) behaves as a diverging lens when immersed in carbon di-sulphide of higher refractive index (f=1.65) STATEMENT 2 the focal length of lens does not depend on the colour of light used.

A hollow convex lens of glass will behave like a

A double convex glass (u_g = 1.5) lens of radii of curvatures 20 cm each immersed in carbno disulphide, (mucs_2 = 1.65) .Find the focal length.

When does a convex lens behave as a concave lens ?