Question

a luminous object and a screen are placed 90 cm apart to cast an image magnified twice the size of the object on the screen, what type of screen is required and what will be the focal length??​

Answer 1

Answer:

Light - Reflection and Refraction. An illuminated object and a screen are placed 90 cm apart. What is the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object? ... Object distance, u = -30 cm.