Lenses and Mirrors Quiz - CBSE Class 12 Physics

Free practice quiz: Lenses and Mirrors (CBSE Class 12 Physics). 15 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Physics practice quiz has 15 multiple-choice questions on Lenses and Mirrors, and 15 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is a convex lens?

   1. A lens that diverges light
   2. A lens that converges light
   3. A lens that absorbs light
   4. A lens that reflects light
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   Answer: B. A lens that converges light

   A convex lens is a lens that bends light rays inward, causing them to converge at a point. This is the defining characteristic of convex lenses.

2. What happens to light rays that pass through the focal point of a convex lens?

   1. They diverge
   2. They converge
   3. They remain parallel
   4. They are absorbed
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   Answer: B. They converge

   Light rays passing through the focal point converge as they exit the lens, allowing them to meet at a point on the opposite side.

3. When an object is placed closer than the focal length of a convex lens, what type of image is formed?

   1. Real and inverted
   2. Virtual and upright
   3. Real and upright
   4. No image is formed
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   Answer: B. Virtual and upright

   If the object is placed within the focal length of a convex lens, a virtual and upright image is formed on the same side as the object.

4. How is the image distance related to the object distance in a concave mirror?

   1. Image distance is always less than object distance
   2. Image distance can be equal to object distance
   3. Image distance is always greater than object distance
   4. Image distance equals object distance in all cases
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   Answer: B. Image distance can be equal to object distance

   Depending on the position of the object with respect to the focal point and center of curvature, the image distance can be equal to, less than, or greater than the object distance.

5. How does the color of light affect the focal length in a lens?

   1. Different colors have the same focal length
   2. Shorter wavelengths have longer focal lengths
   3. Longer wavelengths have longer focal lengths
   4. Shorter wavelengths have shorter focal lengths
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   Answer: D. Shorter wavelengths have shorter focal lengths

   In a lens, shorter wavelengths of light (like blue) are refracted more than longer wavelengths (like red), resulting in shorter focal lengths for shorter wavelengths.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which type of lens is thicker in the middle than at the edges?
2. What type of image does a concave mirror form for an object located beyond the center of curvature?
3. If an object is placed at the focal point of a concave lens, what type of image is formed?
4. What is the relationship between the distance of an object from a convex lens and the nature of the image formed?
5. What image is produced by a concave mirror when the object is at the center of curvature?
6. Using lenses, what is the relationship between the focal lengths of two thin lenses in contact?
7. Which of the following can cause total internal reflection?
8. What is the nature of the image formed by a convex mirror regardless of the object distance?
9. What phenomenon explains the formation of a rainbow using lenses?
10. In a double convex lens, what happens to parallel rays of light that enter it?

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