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प्रश्न
A concave lens always forms a virtual image.
पर्याय
True
False
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उत्तर
This statement is True.
Explanation:
A concave lens diverges light rays, resulting in a virtual, erect, and diminished image that cannot be projected onto a screen.
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संबंधित प्रश्न
The distance between principal focus and optical centre of the lens is _________.
- diameter
- focal length
- principal axis
- optical centre
Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the:
(a) lens slightly towards the screen
(b) lens slightly away from the screen
(c) lens slightly towards the sun
(d) lens and screen both towards the sun
An image formed by a concave ______ cannot be obtained on a screen.
A real image cannot be obtained on a screen.
State two differences between a convex and a concave lens.
Which type of lens forms always a virtual image?
A diverging mirror of radius of curvature 40 cm forms an image which is half the height of the object. Find the object and image positions.
Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer.
Write the new Cartesian sign convention for spherical lenses.
My grandfather uses a bifocal lens in his spectacle. Explain why.
