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**Refractive index of diamond with respect to glass is 1.6 and the absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.** - Multiple ChoicePlease save your changes before editing any questions.
**A 10 mm long awl pin is placed vertically in front of a concave mirror. A 10 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is****– 15 cm****– 30 cm****– 45 cm****– 60 cm** - Multiple ChoicePlease save your changes before editing any questions.
**Rays from Sun converge at a point 25 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?****25 cm in front of the mirror****50 cm in front of the mirror****between 25 cm and 50 cm in front of the mirror****more than 50 cm in front of the mirror** - Multiple ChoicePlease save your changes before editing any questions.
Magnification produced by a rear view mirror fitted in vehicles

is less than one

is more than one

is equal to one

can be more than or less than one depending upon the position of the object in front of it.

- Multiple ChoicePlease save your changes before editing any questions.
The mirror having reflecting surface curved inwards

plane mirror

convex mirror

cylindrical mirror

concave mirror

- Multiple ChoicePlease save your changes before editing any questions.
The image which is formed behind the mirror

real image

virtual image

blue image

partial image

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If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:

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A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:

- Multiple ChoicePlease save your changes before editing any questions.
Magnifying power of a concave lens is

always < 1

always > 1

always = 1

none of these

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Out of seven colours of white light, which colour has maximum wavelength?

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D and E are respectively the midpoints on the sides AB and AC of a triangle ABC and BC = 6 cm. If DE || BC, then the length of DE (in cm) is

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Diagonals of a trapezium PQRS intersect each other at the point O, PQ || RS and PQ = 3 RS, Then the ratio of areas of triangles POQ and ROS is:

- Multiple ChoicePlease save your changes before editing any questions.
Areas of two similar triangles are 36 cm

^{2 }and 48 cm^{2}. If the length of a side of the larger triangle is 16 cm, then the length of the corresponding side of the smaller triangle is:$2\sqrt{3}$

$4\sqrt{6}$

$2\sqrt{6}$

None

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In the figure given below DE || BC. If AD = x, DB = x – 2, AE = x + 2 and EC = x – 1, the value of x is:

- Multiple ChoicePlease save your changes before editing any questions.
Corresponding sides of two similar triangles are in the ratio of 2 : 3. If the area of the smaller triangle is 48 cm

^{2}, then the area of the larger triangle is:106 m

^{2}107 m

^{2}108 m

^{2}None