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
At what distance from a biconvex lens of focal length $F$ must an object be placed so that the distance between the object and its real image is minimal?
An 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 SolutionAn object is placed at a distance of $4\,cm$ in front of a concave lens of focal length $12\,cm$. The nature and position of the image from the lens is
Medium
View Solution$A$ plano-convex lens has a diameter of $6\, cm$ and a thickness of $3\, mm$ at the center. If the speed of light in the material of the lens is $2 \times 10^{8}\, m/s$,then the focal length of the lens is ..... $cm$.
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View Solution$A$ convex lens is made of glass $(\mu_g = 1.5)$ and has a focal length of $4 \, cm$ in air. If it is immersed in water $(\mu_w = 1.33)$,what will be its new focal length in $cm$?
Medium
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