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.

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.

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