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प्रश्न
A teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as
A. 12.7 cm
B. 29.7 cm
C. 57.7 cm
D. 72.7 cm
The correct position of the screen was suggested by
(a) A
(b) B
(c) C
(d) D
उत्तर
Here, the object is considered at infinity. Thus, the image will be formed 15 cm away from the lens at its focus. Thus, the screen should be placed at 42.7 + 15 = 57.7 cm mark on the optical bench.
The correct position of the screen was suggested by C.
Hence, the correct answer is option (c).
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संबंधित प्रश्न
An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical 'O', principal focus F and height of the image on the diagram.
For what position of an object a real, diminished image is formed by a convex lens?
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is:
A parallel oblique beam of light falls on a convex lens. Draw a diagram to show the refraction of light through the lens.
While determining the focal length of a convex lens, you try to focus the image of a distant object formed by the lens on the screen. The image formed on the screen, as compared to the object, should be
(A) erect and highly diminished
(B) erect and enlarged
(C) inverted and enlarged
(D) inverted and highly diminished
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?
(ii) Find the size of the image.
(iii) Draw a ray diagram to show the formation of the image in this case.
Can a normal convex lens behave like a concave lens and vice-versa?
Which of the following statements is true?
Distinguish between:
Concave lens and Convex Lens
