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08 October
Which one of the following lens may be used to correct the defective vision?

To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0 m. Which one of the following lenses may be used to correct the defective vision?

Physics
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07 October
Consider the following statements:

i) The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights. ii) Clouds look white because water droplets of clouds scatter all colours of light equally. Which of these statement(s) is/are correct?

Physics
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06 October
Choose False

Which of the following is false?

Physics
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05 October
Correct Statement

Which of the following statements is correct regarding the propagation of light of different colours of white in air?

Physics
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04 October
HCF and LCM

The HCF and the LCM of 12, 21, 15 are respectively

Maths
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03 October
Distance between a spherical lens and the image

The distance between a spherical lens and the image is -15 cm. The lens is

Physics
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01 October
Focal length of this mirror

A 10 mm long awlpin is placed vertically in front of a concave mirror. A 5 mm long image of the awlpin is fromedat 30 cm in front of the mirror.The focal length of this mirror is

Physics
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30 September
Which of the following statements is correct?

Q. A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his textbook.

Physics
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29 September
A point source of light is placed in front of a plane mirror.

Then

Physics
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