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12th Odisha Board
IMPORTANT
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With a simple microscope, if the final image is located at infinity, then it's magnifying power is
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Important Questions on Eye and Optical Instruments
EASY
12th Odisha Board
IMPORTANT
An observer looks at a tree of height with a telescope of magnifying power . To him the tree appears
EASY
12th Odisha Board
IMPORTANT
An astronomical telescope has a converging eyepiece of focal length and an objective of focal length . When the final image is formed at the least distance of distinct vision , the separation between the two lenses is
MEDIUM
12th Odisha Board
IMPORTANT
The focal length of the objective and eyepiece lenses of a microscope are and respectively. The distance between the two lenses is . If the final image is formed at infinity the distance between the object and the objective lens is
MEDIUM
12th Odisha Board
IMPORTANT
The focal length of the objective and eyepiece lenses of a microscope are and respectively. The distance between the two lenses is , then the magnifying power of the microscope is
MEDIUM
12th Odisha Board
IMPORTANT
For an astronomical telescope used in normal adjustment, objective and the eyepiece are separated by a distance of . If the magnifying power of the telescope is , the power of objective is
MEDIUM
12th Odisha Board
IMPORTANT
A certain far-sighted person cannot see objects closer to the eye than . The power of the lens which will enable him to read at a distance of will be
MEDIUM
12th Odisha Board
IMPORTANT
In a compound microscope, the focal lengths of objective and eye-lenses are and respectively. If the object is put away from the objective lens and the final image is formed at infinity, the magnifying power of the microscope is ( Take least distance of distinct vision equal to )
EASY
12th Odisha Board
IMPORTANT
In order to increase the magnifying power of a microscope
