List of top Science Questions on Light asked in CBSE Class X

Draw the ray diagram for the image formation by a lens which shows a magnification of +2.
When the path of a light ray refracted through a glass prism is reversed, how will the angle of deviation change? Explain.
Draw the ray diagram for refraction of light through a glass prism and mark angle of refraction and angle of deviation.
An object is placed at a distance of 30 cm in front of a convex lens of focal length 15 cm. Use lens formula to determine the position of the image. What will be the size of the image in this case?
Arrange the given material mediums in increasing order of speed of light through them. Given Refractive Indices:
  • A = 1.50
  • B = 1.46
  • C = 1.31
  • D = 1.77
Define absolute refractive index of an optical medium.
Rays from the sun converge at a point 25 cm behind a convex lens. The distance at which an object be placed in front of the lens to get a virtual image, is:
Assertion (A): When rays of white light pass through a prism, on emerging they give spectrum of seven colours.
Reason (R): It is due to the scattering of light that red light bends minimum and violet light bends the maximum.
If we want to obtain a virtual and magnified image of an object by using a concave mirror of focal length 18 cm, where should the object be placed? Use mirror formula to determine the object distance for an image of magnification +2 produced by this mirror to justify your answer.
Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.
Assertion (A) : White light is dispersed by a glass prism into seven colours.
Reason (R) : The red light bends the least while the violet the most when a beam of white light passes through a glass prism.
When and where does a rainbow appear in the sky? List the phenomena of light in proper sequence which occurs during the formation of a rainbow. Why can a rainbow not be seen from the surface of the moon?
What is dispersion of white light ? State its cause. Draw a diagram to show dispersion of a beam of white light by a glass prism.
The colour of light for which the refractive index of glass is minimum is:
The phenomena of light involved in the formation of a rainbow are:
How will the image formed by a convex lens be affected, if the upper half of the lens is wrapped with a black paper?