Q. For the given pair of media, the ratio of the sine of the angle of refraction to the sine of the angle of incidence is constant. This principle is called
The correct answer was: Snell’s principle/law
Q. The effective diameter of the circular outline of a spherical lens is called
The correct answer was: Aperture
Q. A ray parallel to the principal axis after reflection from a concave mirror passes through the
The correct answer was: Principal focus
Q. The potential difference between two points is equal to
The correct answer was: Work done / Charge
Q. The focal length of a plane mirror is
The correct answer was: Infinity
Q. Reflection is used to estimate the size of an object
The correct answer was: Size
Q. By adjusting the focal length of the eye lens, the human eye can focus on objects at various distances. This is called
The correct answer was: Accommodation
Q. The SI unit of lens power is
The correct answer was: Diopter
Q. When an object is placed at infinity, the size of the image formed by a convex mirror is
The correct answer was: Point-sized
Q. The reason for the twinkling of a star is
The correct answer was: Atmospheric refraction
Q. Which of the following has the highest refractive index?
The correct answer was: Diamond
Q. The change in focal length of the eye lens is caused by the action of
The correct answer was: Ciliary muscles
Q. The image formed by a plane mirror is always
The correct answer was: Virtual and upright
Q. The blue color of the sky and the red color of the sun at sunrise and sunset are due to
The correct answer was: Scattering of light
Q. The scattering of light by colloidal particles is called
The correct answer was: Tyndall effect
Q. What type of mirror is used to see behind vehicles?
The correct answer was: Convex mirror
Q. The imaginary line passing through the center of curvature and the pole of a spherical mirror is called
The correct answer was: Principal axis
Q. The retina of the eye is
The correct answer was: A light-sensitive layer
Q. One ampere of electric current is
The correct answer was: 1 Coulomb / 1 Second
Q. The type of mirror used by dentists to view large images of patients’ teeth is
The correct answer was: Concave
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