What is a lens?
- A$A$ transparent medium bounded by two surfaces,at least one of which is spherical.
- B$A$ mirror used for reflection.
- C$A$ device used to measure light intensity.
- D$A$ solid block of glass with flat surfaces.
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Similar Questions
If the aperture of a lens is halved,then the image will be:
Medium
View SolutionWhen an object is at a distance $u_1$ and $u_2$ from a lens,a real image and a virtual image are formed,respectively,having the same magnification $m$. The focal length of the lens is:
Medium
View Solution$A$ convex lens has a focal length of $0.3 \ m$ and a refractive index of $3/2$. Find the focal length of the lens in $m$ when it is immersed in water,which has a refractive index of $4/3$.
Difficult
View SolutionAn object approaches a convergent lens from the left of the lens with a uniform speed $5 \, m/s$ and stops at the focus. The image:
Difficult
View SolutionIf in a plano-convex lens,the radius of curvature of the convex surface is $10 \ cm$ and the focal length of the lens is $30 \ cm,$ then the refractive index of the material of the lens will be
Easy
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