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CBSE Class 10 – Light (Reflection & Refraction) PYQs by Alamin Sir

 

🔹 CBSE Class 10 – Light (Reflection & Refraction) PYQs

📘 1. Year: 2023

Q1. An object is placed at a distance of 30 cm from a concave mirror of focal length 15 cm.
Find the position and nature of the image formed.

Q2. Define refractive index. A ray of light enters from air into glass. What happens to its speed and why?

📘 2. Year: 2022

Q3. A convex lens of focal length 20 cm forms an image of an object placed 30 cm away.
Find the position of the image using lens formula.

Q4. Why does a ray of light bend when it passes from one medium to another?

📘 3. Year: 2020

Q5. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm.
Calculate the position and size of the image.

Q6. Draw a ray diagram to show the formation of image by a concave lens when the object is placed at infinity.

📘 4. Year: 2019

Q7. State the laws of reflection of light.

Q8. An object is placed at 25 cm from a convex lens of focal length 10 cm.
Calculate image distance and magnification.

📘 5. Year: 2018

Q9. A ray of light passes from air into water.
Explain why it bends towards the normal.

Q10. Define power of a lens. Calculate power of a lens of focal length 50 cm.

📘 6. Year: 2017

Q11. An object is placed beyond the centre of curvature of a concave mirror.
Where is the image formed? State its nature.

Q12. What is refraction? State the laws of refraction.

📘 7. Year: 2016

Q13. A concave lens has focal length of 15 cm.
Where should the object be placed so that the image is formed at 10 cm?

Q14. Explain why a pencil partly immersed in water appears bent.

📘 8. Year: 2015

Q15. Write sign convention for spherical mirrors.

Q16. A ray of light travelling from glass to air bends away from the normal. Why?


🔹 CBSE Class 10 – Light PYQs (2005–2014)

📘 2014

Q1. An object 4 cm high is placed at a distance of 30 cm from a convex lens of focal length 15 cm.
Find the position, size, and nature of the image.

Q2. Define refractive index. Write its unit and explain its significance.

📘 2013

Q3. An object is placed at 20 cm from a concave mirror of focal length 15 cm.
Find image position and magnification.

Q4. Draw ray diagram for image formation by a convex lens when object is between F and 2F.

📘 2012

Q5. State Snell’s law of refraction.

Q6. A ray of light passes from air to glass.
What happens to its speed and wavelength?

📘 2011

Q7. An object is placed at 10 cm from a convex lens of focal length 20 cm.
Find image distance using lens formula.

Q8. Why does a ray of light bend when it passes from one medium to another?

📘 2010

Q9. State the laws of reflection.

Q10. An object is placed beyond centre of curvature of a concave mirror.
Where is the image formed? State nature and size.

📘 2009

Q11. Define power of a lens.
Calculate power of a lens of focal length 25 cm.

Q12. Draw ray diagram for concave lens showing image formation.

📘 2008

Q13. Define refractive index and write its formula.

Q14. A convex mirror is used as rear-view mirror. Why?

📘 2007

Q15. A ray of light passes from glass to air.
Explain why it bends away from the normal.

Q16. Write mirror formula and explain each term.

📘 2006

Q17. An object is placed at 15 cm from a concave mirror of focal length 10 cm.
Find image position.

Q18. What is refraction? State its laws.

📘 2005

Q19. Define principal focus of a concave mirror.

Q20. A lens has power +2D. Find its focal length.




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