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Two thin lenses are of same focal length (f), but one is convex and the other is concave, When they are placed in contact with each other, the equivalent focal length of the combination will be :
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- 1)
Which of the following pair is INCORRECT for some transparent media with respect toair? (may consider the most approximate value)
- 2)
Find the value of 'X' and 'h' in the following diagram.
- 3)In the figure given below, APB is a curved surface of radius of curvature 10 cm separating air and a transparent material (μ= 4/3). A point object O placed in air on the principal axis of the surface 20 cm from P. The distance of the image of O from P will be ____________.
Fill in the blank with the correct answer from the options given below. - 4)For fixed values of radii of curvature of lens. power of the lens will be _____________.
Fill in the blank with the correct answer from the options given below. - 5)The graph correctly representing the variation of image distance 'v' for a convex lens of focal length ‘f’ versus object distance ‘u’ is ___________.
Fill in the blank with the correct answer from the options given below. - 6)The refractive index of the material of an equilateral prism is
The angle of minimum deviation of that prism is _________.
Fill in the blank with the correct answer from the options given below. - 7)Lower half of a convex lens is made opaque. Which of the following statement describes the image of the object placed in front of the lens?
(A) No change in image
(B) Image will show only half of the object
(C) Intensity of image gets reduced
Choose the correct answer from the options given below. - 8)For an astronomical telescope having objective lens of focal length 10 m and eyepiece lens of focal length 10 cm, telescope's the tube length and magnification respectively are ______________.
Fill in the blank with the correct answer from the options given below. - 9)
A coin of diameter 10 cm is placed at a distance 3.5 f from the pole of a concave mirror of focal length f. The linear magnification and the diameter of the image are:
- 10)
Which of the following pair is INCORRECT for some transparent media with respect toair? (may consider the most approximate value)
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