STATEMENT-`1` Air bubble in glass medium behaves as concave lens.
`STATEMENT 2`Lens formula is `(1)/(f)=((mu_("lens"))/(mu_("med"))-1) [(1)/(R_(1))-(1)/(R_(2))]`

An air bubble inside water broadly behaves as a concave lens. Is the true or false.

STATEMENT- 1 Power of a lens depends on nature of material of lens, medium in which it is placed and radii of curvature of its surface. STATEMENT 2 it follows the relation p=(1)/(f)=((mu_(2))/(mu_(1))-1)[(1)/(R_(1))-(1)/(R_(2))]

STATEMENT- 1 The focla lengh of a lens does not depend on the medium in which it is submerged. STATEMENT 2 (1)/(f)=(mu_(2)-mu_(1))/(mu_(1))((1)/(R_(1))-(1)/(R_(2)))

STATEMENT- 1 The focal length of a lens does not depend on the medium in which it is submerged. STATEMENT- 2 (1)/(f)=(mu_(2)-mu_(1))/(mu_(1))((1)/(R_(1))-(1)/(R_(2)))

Derive lens maker formula 1/f=(mu_(2)-mu_(1)/mu_1)(1/R_(1) - 1/R_(2))

Assertion : A double convex lens (mu=1.5) has focal length 10 cm . When the lens is immersed in water (mu=4//3) its focal length becomes 40 cm . Reason : (1)/(f)=(mu_(1)-mu_(m))/(mu_(m))((1)/(R_(1))-(1)/(R_(2)))