Physics
The incorrect statement is :
- both convexo-concave and concavo-convex lenses have one surface concave and the other surface convex.
- a convexo-concave lens is thicker in the middle and has a converging action.
- A concavo-convex lens is thicker in the middle and has a converging action.
- a convexo-concave lens is thinner in the middle and has a diverging action.
Refraction Lens
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Answer
a convexo-concave lens is thicker in the middle and has a converging action.
Reason — A convexo-concave lens has one surface concave and the other surface convex such that it is thinner in the middle as compared to its periphery.
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Related Questions
The given figure shows a kind of a lens. It is a:
- convex lens
- biconvex lens
- concave lens
- concavo-convex
A convex lens in its upper part has a prism with its base …………… and a concave lens in its upper part has a prism with its base …………… :
- downward, upward
- upward, downward
- upward, upward
- downward, downward
The correct differences between a convex and concave lens are :
(a) convex lens is thin in the middle and concave lens is thick in the middle.
(b) convex lens converges the incident rays towards the principal axis whereas concave lens diverges
(c) convex lens has a virtual focus and concave lens has a real focus.
- (a)
- (c)
- (a), (b) and (c)
- (b)
A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray passes through :
- its optical centre
- its first focus
- its second focus
- the centre of curvature of the first surface.