Light quiz

Light travels in:

The image formed by a plane mirror is:

A rear view mirror in a car is a:

A magnifying glass is a:

An image that can be obtained on a screen is:

White light is made up of:

If you raise your right hand in front of a plane mirror, the image raises its:

Dentists use a:

A convex mirror always forms an image that is:

Splitting of white light into colours can be seen using a:

Why is "AMBULANCE" written in reverse on ambulances? (2 marks)

How can you show that light travels in a straight line using a pipe and a candle? (2 marks)

State two characteristics of the image formed by a plane mirror. (2 marks)

Why are convex mirrors used as rear view mirrors? (2 marks)

Which mirror can form both real and virtual images? (2 marks)

What is a spherical mirror? How is a spoon an example? (2 marks)

Can a virtual image be obtained on a screen? Explain. (2 marks)

Why should we not look at the Sun through a convex lens? (2 marks)

Name the device that shows that white light is made of seven colours when rotated. (2 marks)

What is the difference between a lens and a mirror? (2 marks)

A girl stands 3 m from a plane mirror. She moves 1 m closer. Find (i) her new distance from the mirror (ii) the new distance between her and her image (iii) how much closer she is to her image than before. (3 marks)

A plane mirror is fixed on a wall 4 m from a chair. An object is kept on the chair. Where is the image formed and how far is it from the chair? If the chair is moved 1.5 m away from the mirror, find the new image distance from the chair. (3 marks)

Write how these words look in a plane mirror: (i) TOM (ii) BOOK (iii) MOM. Which of these look the same? (3 marks)

Classify these images as real or virtual: (i) image on a cinema screen (ii) image in a bathroom mirror (iii) image of the Sun formed by a convex lens on paper (iv) image in a car rear view mirror (v) image in a magnifying glass (vi) image of a candle on a screen with a concave mirror. (3 marks)

A Newton's disc is divided into seven equal sectors. Find the angle of each sector to the nearest degree. Name the colours in order from violet. (3 marks)

Read the passage and answer the questions. In a hilly road with sharp bends, convex mirrors are placed at turns so drivers can see vehicles coming from the other side. (i) Why are convex mirrors used here? (ii) What kind of image do they form? (iii) Why can't plane mirrors be used? (5 marks)

Read the passage and answer the questions. Paheli held a convex lens in sunlight over a sheet of paper. After a while the paper began to burn at a bright spot. (i) What is the bright spot? (ii) Why did the paper burn? (iii) Is the image of the Sun real or virtual? (5 marks)

Read the passage and answer the questions. Boojho looked into a shiny steel spoon. On the inner side his face looked upside down; on the outer side it was erect but smaller. (i) Which side acted as a concave mirror? (ii) Which side acted as a convex mirror? (iii) What happens on the inner side when he brings it very close? (5 marks)

Read the passage and answer the questions. After a shower in the evening, children saw a colourful arc in the sky opposite the Sun. (i) What is the arc called? (ii) Name its colours in order. (iii) What acts like a prism here? (5 marks)

Read the passage and answer the questions. A dentist uses a small mirror to look at a patient's teeth, while a watch repairer uses a lens to see tiny parts. (i) Which mirror does the dentist use? (ii) Which lens does the watch repairer use? (iii) What kind of image do both give? (5 marks)

Describe an activity to study the image formed by a plane mirror using a candle, a glass plate or mirror, and a screen. List all characteristics of the image. (6 marks)

Describe an activity with a concave mirror and a candle to show that it can form a real image. Draw the set-up and explain what happens as the candle is moved closer. (6 marks)

Compare concave and convex mirrors in a structured answer: shape, nature of image and two uses each. Draw both. (6 marks)

Explain how white light is split by a prism and recombined by Newton's disc. Draw a labelled diagram of a prism showing the spectrum. (6 marks)

Explain the working of a periscope using two plane mirrors. Draw a labelled diagram and state one use. (6 marks)