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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
Question
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: The image of a virtual object formed by a thin converging lens is always real.
Reason: In the case of a thin lens $\frac{1}{\text{v}}-\frac{1}{\text{u}}=\frac{1}{\text{f}}$
✓

Answer

  1. Both A and Rare true, but R is not the correct explanation of the assertion.

Explanation:

For virtual object 

$\text{u} = + \text{x}\text{F} = + \text{f}$

$\therefore\frac{1}{\text{v}}-\frac{1}{\text{u}}=\frac{1}{\text{f}}$

 or $\frac{1}{\text{v}}-\frac{1}{\text{x}}=\frac{1}{\text{f}}$ or $\frac{1}{\text{v}}-\frac{1}{\text{f}}=\frac{1}{\text{x}}$

$\therefore$ v > 0, it means image is real.

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