A diverging lens of focal length 30cm produces an image 2...
A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance
10cm
12cm
50cm
60cm
Correct answer is B
Lens formula:
1f=1do+1di
where f, do and di are the focal length, object distance and image distance respectively.
The distance from the lens to the focal point is called the focal length. For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.
⇒ −130=1do+120
1do=−130−120
1do=−2+−360
→ \frac{-5}{60}\) = \frac{-1}{12}\)
do=−12cm
The object distance -12cm = 12cm on the other side of the lens.
Which of the following factors does not affect the rate of evaporation of a liquid? ...
Determine the potential difference. V across the parallel resistors ...
In which of the following material media will sound travel fastest? ...
Which of the following is a desirable property of a fuse Wire? ...
The carbon-granules microphone works on the principle of change in ...
Calculate the angle of minimum deviation of a 60º prism of a refractive index 1.5[ \(sin^{...
According to kinetic molecular model, in gases ...
A sheet of paper is placed in the path of the following radiations: I. Alpha particles II. Beta ...