1.What type of image is always formed by a convex mirror?
Why?
A convex mirror has a curved surface that bulges outward. It always forms an image that is virtual (appears behind the mirror), diminished (smaller than the object), and erect (b). These properties are true regardless of where the object is placed.
2.The optical device which uses a convex lens to magnify an object by creating a virtual image:
Why?
A magnifying glass uses a convex lens to form a virtual, magnified image of an object placed close to it (b). When the object is between the lens and its focal point, the lens creates an enlarged virtual image that you see when looking through it.
3.Which statement best describes the phenomenon of total internal reflection?
Why?
Total internal reflection occurs when light traveling through a denser medium hits the boundary with a less dense medium at an angle greater than the critical angle. At this point, all the light is completely reflected back into the first medium instead of being refracted (b).
4.A ray of light travelling from water to air bends:
Why?
When light travels from a denser medium (water) to a less dense medium (air), it bends away from the normal (b). This is because light speeds up in the less dense medium, so by Snell's law, the refracted ray bends away from the normal line.
5.The optical device which works on the principle of inverting an image for projection is:
amagnifying glass
bslide projector
cphotograph Enlarger
dplane mirror
6.What happens to light when it enters an optical fibre?
Why?
Optical fibers are designed to trap light inside the fiber using total internal reflection (b). Light entering the fiber at a shallow angle bounces repeatedly off the fiber's curved walls, reflecting internally, and travels along the fiber to transmit data or light over long distances.
7.Which of the following phenomenon explains why a pencil appears bent when partially immersed in water?
Why?
When a pencil is partially submerged in water, the part underwater appears bent because light bends at the water-air boundary. This bending of light as it passes from one medium to another is called refraction (c).
SLO Based Additional MCQs + Past papers MCQs of Punjab Boards - Reflection of Light
1.Which of the following is not a characteristic of an image formed by a plane mirror?
Why?
Plane mirrors form images that are virtual, erect, laterally inverted, and the same size as the object. The image is NOT real and NOT diminished. Since the question asks which is NOT a characteristic, the answer is 'real and diminished' (c).
2.When light hits a rough surface like paper, what type of reflection occurs?
Why?
When light hits a rough surface like paper, the surface has many tiny irregularities at different angles. Light reflects off these irregularities in many different directions instead of in one direction, creating diffused reflection (c). This is why paper does not act like a mirror.
3.What happens to the speed of light when it passes from air into glass?
Why?
Light travels slower in denser media than in empty space or air. Glass is denser than air, so when light enters glass from air, its speed decreases (b). This change in speed is what causes light to refract at the boundary.
4.The bending of light as it passes from one medium to another is called:
5.According to the qualitative principle of refraction, light bends towards the normal when it:
6.Total internal reflection can only occur when light travels from:
7.Which part of an optical fibre has a higher refractive index?
8.Which of the following is a key advantage of optical fibres over copper cables?
9.A lens that is thinner at the centre and thicker at the edges is a:
10.The distance from the optical centre of a lens to its principal focus is called:
11.A lens with a focal length of -0.5 m has a power of:
12.In a myopic eye, the image of a distant object is formed:
13.Which type of lens is used to correct hypermetropia (long-sightedness)?
14.In a simple camera, the object is placed beyond 2F of the convex lens to form an image that is:
15.For a magnifying glass to produce a virtual, upright, and enlarged image, the object must be placed:
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