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प्रश्न
A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do?
(A) Should move the mirror away from the screen.
(B) Should move the mirror towards the screen.
(C) Should move the mirror and screen both towards the sun.
(D) Should move only the screen towards the sun.
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उत्तर
Initially, the screen was placed beyond the focus to capture the image of the candle flame placed at a finite distance from the mirror. So, in order to capture a bright image of the Sun (at infinity) on the screen, the student should move the mirror towards the screen.
Hence, the correct option is B.
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संबंधित प्रश्न
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
An image which can be obtained on a screen is called a ______ image.
Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
Define the following term in relation to concave mirror.
Aperture
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
Geometric centre of the spherical mirror is ______.
An object is placed at a distance of 0.25 m
in front of a plane mirror. The distance between the object and image will be ______.
The image formed in a plane mirror is always inverted.
