Light
Practice Light MCQs from Physics — Science.
What is the effect of increasing the aperture of a mirror on its focal length?
If the speed of light in a medium is 1.5 x 10^8 m/s, what is the critical angle for that medium with respect to air?
Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:
An object is placed at a distance of 12 cm from a concave mirror of focal length 8 cm. Find the image distance.
A ray of light passes through three media with refractive indices n1, n2, and n3. If n1 > n2 > n3, which medium has the smallest angle of refraction?
If the refractive index of glass is 1.5 and that of water is 1.33, what is the refractive index of glass with respect to water?
A convex lens forms a real image of a point object at a distance of 50 cm. If the object is at 50 cm, what is the power?
What is the apparent depth of a 12 cm deep tank of water (n=4/3) when viewed from above?
A glass slab of thickness 6 cm is placed over a paper. How much does the text appear to be raised (n=1.5)?
A person can see objects clearly only between 50 cm and 200 cm. What lens is required to see distant objects?
Two plane mirrors are inclined at 60 degrees. How many images of an object placed between them will be formed?
The magnifying power of a telescope is 10 and its length is 110 cm. What are the focal lengths of the lenses?
A ray of light is incident at 60 degrees on one face of an equilateral prism. If it suffers minimum deviation, the angle of refraction inside the prism is:
A concave mirror has a radius of curvature of 40 cm. To get an image twice the size of the object, the object distance should be:
A ray of light enters a glass slab at an angle 'i'. If the lateral displacement is half the thickness, and the refractive index is sqrt(3), find 'i'.
A lens of power P is cut into two equal halves along the principal axis. The power of each half is:
Light of wavelength 6000 Angstroms in air enters a medium of refractive index 1.5. What is the wavelength in the medium?
If a convex lens of focal length 20 cm and a concave lens of focal length 50 cm are combined, the system behaves as a: