AIIMS 2007
- Exam
- AIIMS
- Year
- 2007
- Subject
- Physics
- Chapter
- Ray Optics
AIIMS 2007 · Physics · Ray Optics
Assertion : Goggles have zero power. Reason : Radius of curvature...
Assertion : Goggles have zero power.
Reason : Radius of curvature of both sides of lens is same
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion
Step-by-step solution
The focal length is given by (\frac{1}{f}=(\mu-1)\left(\frac{1}{R_1}-\frac{1}{R_2}\right)). For goggle lenses, both sides are curved the same way. and are positive. If they are the same, (\frac{1}{f}=0) i.e. power is zero.