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The refractive index of transparent medium is greater than one because

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(a) Speed of light in vacuum < speed of light in tansparent medium (b) Speed of light in vacuum > speed of light in tansparent medium (c) Speed flight in vacuum = speed of light in tansparent medium (d) Frequency ...

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Class 10 science 3 years 1 Answer 27 views Enlightened 0

As light travels from a rarer to a denser medium it will have

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(a) increased velocity (b) decreased velocity (c) decreased wavelength (d) both (b) and (c)

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Class 10 science 3 years 1 Answer 23 views Enlightened 0

The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be

Question

(a) real, inverted and diminished in size (b) real, inverted and enlarged in size (c) virtual, upright and diminished in size (d) virtual, upright and enlarged in size

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Class 10 science 3 years 1 Answer 12 views Enlightened 0

.A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by

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(a) 15 (b) 20 (c) 30 (d) 0

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Class 10 science 3 years 1 Answer 71 views Enlightened 0

The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be

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(a) at the focus (b) at the centre of curvature (c) between focus and centre of curvature (d) beyond centre of curvature

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Class 10 science 3 years 1 Answer 31 views Enlightened 0

A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at

Question

(a) 25 cm (b) 40 cm (c) 10 cm (d) At infinity

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Class 10 science 3 years 1 Answer 24 views Enlightened 0

An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is

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(a) – 30 cm (b) 30 cm (c) – 15 cm (d) +15 cm

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Class 10 science 3 years 1 Answer 12 views Enlightened 0

which of the following mirror is used by a dentist to examine a small cavity?

Question

(a) Convex mirror (b) Plane mirror (c) Concave mirror (d) Combination of convex and concave mirror

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Class 10 science 3 years 1 Answer 3 views Enlightened 0

Who first demonstrated the existence of em waves?

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(a) Hertz (b) Maxwell (c) Ampere (d) Faraday

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Class 12 Physics 3 years 1 Answer 4 views Enlightened 0

Who first demonstrated the existence of em waves?

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Class 12 Physics 3 years 0 Answers 12 views Enlightened 0

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