If the magnification of a virtual image formed of an obje...
If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is
10cm
15cm
16cm
19cm
20cm
Correct answer is B
V = 3u, U = 10cm
therefore U = -ve,
F = UVU+V
= 10×(−30)10−30
= 15cm
Which of the following radiations has it's frequency lower than that of infrared radiation? ...
The power of the lens is +2.5D. What is the radius of the curvature? ...
Which of the following is/are in random motion? i. Pollen grains in water ii. The molecules of h...
Which of the following features is NOT a characteristic of natural radioactivity? ...
When white light passes through a triangular glass prism, there is dispersion because of ...