Light – Reflection and Refraction Class 10 MCQ Quiz – Test Your Understanding!

Assertion (A): Refractive index has no units.

Reason (R):  The refractive index is the ratio of two similar quantities.

The figure below shows a ray of light as it travels from medium A to medium B. Refractive index of medium B relative to medium A is

A. Noor, a young student, was trying to demonstrate some properties of light in her science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter paper screen to see the spots of light being cast as they emerged.

Her friend noted the following observations from this demonstration:

1.  Glass is optically rarer than air.
2.  Air and glass allow light to pass through them with the same velocity.
3.  Air is optically rarer than glass.
4. The speed of light through a denser medium is faster than that of a rarer medium.
5.  The ratio of the sin of the angle of incidence in the first medium to the ratio of the sin of the angle of refraction in the second medium gives the refractive index of the second material with respect to the first one.

Which one of the following combinations of the above statements given below is correct?

Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth?

If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between the lens and image is 80 cm, at what distance should the candle be placed from the lens?

A. Noor, a young student, was trying to demonstrate some properties of light in her science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter paper screen to see the spots of light being cast as they emerged.

If the object inside the box was made of a material with a refractive index less than 1.5 then the

While looking at the below diagram, Nalini concluded the following:

1. The image of the object will be a virtual one.
2. The reflected ray will travel along the same path as the incident ray but in the opposite direction.
3. The image of the object will be inverted.
4. This is a concave mirror and hence the focal length will be negative.

Which one of the above statements is correct?

In the diagram shown below, a beam of light is traveling from inside a glass slab to air. Which of the marked paths will the ray of light take as it emerges from the glass slab?

Assertion (A): A convex mirror is used as a rearview/driver’s mirror.

Reason (R): Convex mirrors have a wider field of view as they are curved outwards. They also give an erect, though the diminished image.

As a ray of light entered medium P from medium Q, its velocity increased.

What can be said about the refractive index of medium P as compared to that of medium Q?

Consider these indices of refraction:

• Glass: 1.52
• Air: 1.0003
• Water: 1.333

Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order.

A. Noor, a young student, was trying to demonstrate some properties of light in her science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter paper screen to see the spots of light being cast as they emerged.

What could be the ‘X’ that she placed inside the box to make the rays behave as shown?

The below lens has a focal length of 10 cm. The object of height 2 mm is placed at a distance of 5 cm from the pole. Find the height of the image.

No matter how far you stand from this spherical mirror, your image always appears erect. The mirror may be:

What is the formula for magnification obtained with a lens?