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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction2 Marks
Question
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen.
✓

Answer

Following are the precautions while making the image by hte help of convex lens:
  1. Fix the convex lens vertically in the lens holder.
  2. The base of the lens and white screen should be in a line with the measuring scale.
  3. Record the position of the lens and screen only when a well defined sharp image is formed.
  4. There should not be any obstacle in the path of the convex lens.

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