Final image produced by a compound microscope is
A. real and inverted
B. real and erect
C. virtual and erect
D. virtual and inverted
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Physics
In multimode step index fibre the refractive index of core and cladding is
A. same
B. different
C. zero
D. different with refractive index of core higher than cladding
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A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is
A. f2 + f1
B. f2 – f1
C. f1f2/f2+f1
D. f1f2/f1-f2
If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from
A. chromatic aberration
B. spherical aberration
C. both spherical and chromatic
D. distortion
The least distance of distinct vision for a normal eye is
A. 15 cm
B. 25 cm
C. 30 cm
D. 40 cm
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Magnifying power of simple microscope
A. increase with increase in focal length
B. increase with decrease in focal length
C. no effect with decrease or increase with focal length
D. list distance of distinct vision
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If an object is placed away from 2f of a converging lens then the image will be
A. real and erect
B. virtual and erect
C. real and inverted
D. virtual
If an object is placed away from 2f of a converging lens then the image will be Read More »
The power of a concave lens is
A. real
B. virtual
C. positive
D. negative
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Unit of power of a lens is
A. meter
B. watt
C. diopter
D. horsepower
Unit of power of a lens is Read More »
The diameter of a lens is called
A. focal length
B. principal axis
C. aperture
D. radius of curvature
The diameter of a lens is called Read More »