Ray Optics and Optical Instruments

Question: A student can distinctly see the object upto a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be

1) $-\,4.8\,cm,\ -\,3.3\,D$

2) $-\,5.8\,cm,\ -\,4.3\,D$

3) $-\,7.5\,cm,\ -\,6.3\,D$

4) $-\,15.8\,cm,\ -\,6.3\,D$

Solution:

Explanation: No Explanation

Human Eye and Lens Camera

Rate this question:

★ ★ ★ ★ ★

Average rating: (0 votes)