by Tiwari Academy
NCERT Solutions for Class 8 Science Curiosity Chapter 10 Light: Mirrors and Lenses for Session 2025-26. Class 8 Curiosity solutions give a detailed understanding of how light behaves when it falls on mirrors and lenses. The chapter explains concepts like reflection, refraction, focal length and the formation of images with clear examples and diagrams. These solutions simplify complex ideas, enhance conceptual clarity and improve analytical thinking. By solving textbook questions step-by-step, students develop a strong foundation in optics and gain confidence for higher classes and examinations.
Class 8 Science Curiosity Chapter 10
Class 8 Science Curiosity Chapter 10 MCQ
Class 8 Science Old Book Chapter 10 MCQ
Class 8 Science Old Book Chapter 10 Solutions
Light: Mirrors and Lenses Class 8 Science Curiosity Chapter 10 Solutions
1. A light ray is incident on a mirror and gets reflected by it (Fig. 10.21). The angle made by the incident ray with the normal to the mirror is 40°. What is the angle made by the reflected ray with the mirror?
(i) 40° (ii) 50° (iii) 45° (iv) 60°
See Answer(ii) 50°
• Angle of incidence (i) = 40°
• Angle of reflection (r) = 40°
• Angle with mirror = 90° – 40° = 50°
2. Fig. 10.22 shows three different situations where a light ray falls on a mirror:
(i) The light ray falls along the normal.
(ii) The mirror is tilted, but the light ray still falls along the 20° normal to the tilted surface.
(iii) The mirror is tilted and the light ray falls at and angle of 20° from the normal.
Draw the reflected ray in each case (Use a ruler and protractor for accurate drawing). What is the angle of reflection in each case?
Answer:
Class 8 Science Curiosity Chapter 10 Question 3 and 4
3. In Fig. 10.23, the cap of a sketch pen is placed in front of three types of mirrors.
Answer:
4. In Fig. 10.24 the cap of a sketch pen is placed behind a convex lens, a concave lens and a flat transparent glass piece — all at the same distance.
Match each image with the correct type of lens or glass.
| Image | Lens/glass type |
|---|---|
| (i) Flat transparent glass piece | |
| (ii) Convex lens | |
| (iii) Concave lens |
Answer:
Download App for Class 8
Question 5 and 6 of Class 8 Science Curiosity Chapter 10
5. When the light is incident along the normal on the mirror, which of the following statements is true:
(i) Angle of incidence is 90°
(ii) Angle of incidence is 0°
(iii) Angle of reflection is 90°
(iv) No reflection of light takes place in this case
See Answer(ii) Angle of incidence is 0°
(The ray retraces its path).
6. Three mirrors — plane, concave and convex are placed in Fig. 10.25. On the basis of the images of the graph sheet formed in the mirrors, identify the mirrors and write their names above the mirrors.
See Answer• Convex mirror → erect, diminished image.
• Plane mirror → same size, erect image.
• Concave mirror → enlarged/inverted depending on distance.
Class 8 Science Curiosity Chapter 10 Question 7, 8 and 9
7. In a museum, a woman walks towards a large convex mirror (Fig. 10.26). She will see that:
(i) her erect image keeps decreasing in size.
(ii) her inverted image keeps decreasing in size.
(iii) her inverted image keeps increasing in size and eventually it becomes erect and magnified.
(iv) her erect image keeps increasing in size.
See Answer(i) her erect image keeps decreasing in size.
8. Hold a magnifying glass over text and identify the distance where you can see the text bigger than they are written. Now move it away from the text. What do you notice? Which type of lens is a magnifying glass?
See Answer• Text appears bigger (enlarged) when the lens is held close.
• On moving away, text may become inverted/diminished.
• A magnifying glass is a convex lens.
9. Match the entries in Column I with those in Column II.
| Column I | Column II |
|---|---|
| (i) Concave mirror | (a) Spherical mirror with a reflecting surface that curves inwards. |
| (ii) Convex mirror | (b) It forms an image which is always erect and diminished in size. |
| (iii) Convex lens | (c) Object placed behind it may appear inverted at some distance. |
| (iv) Concave lens | (d) Object placed behind it always appears diminished in size. |
Answer:
| Column I | Column II |
|---|---|
| (i) Concave mirror | (a) Spherical mirror with a reflecting surface that curves inwards. |
| (ii) Convex mirror | (b) It forms an image which is always erect and diminished in size. |
| (iii) Convex lens | (c) Object placed behind it may appear inverted at some distance. |
| (iv) Concave lens | (d) Object placed behind it always appears diminished in size. |
Class 8 Science Curiosity Chapter 10 Question 10, 11 and 12
10. Assertion: Convex mirrors are preferred for observing the traffic behind us.
Reason: Convex mirrors provide a significantly larger view area than plane mirrors.
Choose the correct option:
(i) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
(ii) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
(iii) Assertion is correct but Reason is incorrect.
(iv) Both Assertion and Reason are incorrect.
See Answer(i) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
11. In Fig. 10.27, note that O stands for object, M for mirror, and I for image. Which of the following statements is true?
(i) Figure (a) indicates a plane mirror and Figure (b) indicates a concave mirror.
(ii) Figure (a) indicates a convex mirror and Figure (b) indicates a concave mirror.
(iii) Figure (a) indicates a concave mirror and Figure (b) indicates a convex mirror.
(iv) Figure (a) indicates a plane mirror and Figure (b) indicates a convex mirror.
See Answer(iv) Figure (a) indicates a plane mirror and Figure (b) indicates a convex mirror.
12. Place a pencil behind a transparent glass tumbler (Fig. 10.28a). Now fill the tumbler halfway with water (Fig. 10.28b). How does the pencil appear when viewed through the water? Explain why its shape appears changed.
See Answer• The pencil appears bent or displaced at the water surface.
• This is because of refraction of light: light bends when it passes from water to air.
• So the pencil looks broken or shifted at the boundary.
