An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?
- 3.9 cm
-18.5 cm
+18.5 cm
+ 3.9 cm
Since, it is a diverging lens, that is, a concave lens, we have
u = -10 cm, v = -6.5 cm
Thus,
A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens?
An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from the lens?
A diverging lens, focal length f1=20 cm is separated by 5 cm from a converging mirror, focal length f2=10 cm. Where should an object be placed from the lens so that a real image is formed at the object itself ?
A concave lens of focal length 15cm forms an image 10cm from the lens. how far is the object placed from the lens?
A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.