A normal human eye can see an object making an angle of at the eye. What is the approximate height of object which can be seen by an eye placed at a distance of from the object?
Important Questions on Ray Optics
Given below are two statements : one is labeled as Assertion and the other is labeled as Reason .
Assertion : For a simple microscope, the angular size of the object equals the angular size of the image.
Reason : Magnification is achieved as the small object can be kept much closer to the eye than and hence it subtends a large angle. In the light of the above statements, choose the most appropriate answer from the options given below:
The focal lengths of objective lens and eye lens of a Galilean Telescope are respectively 30 cm and 3.0 cm. Telescope produces virtual, erect image of an object situated far away from it at least distance of distinct vision from the eye lens. In this condition the Magnifying Power of the Galilean Telescope should be :
Both the eye and the camera have convex lenses.
In order to focus, the eye lens expands or contracts while the camera lens moves forward or backward.
The camera lens produces upside down real images while the eye lens produces only upright real images.
A screen in camera is equivalent to the retina in the eyes.
A camera adjusts the amount of light entering in it by adjusting the aperture of the lens. In the eye the cornea controls the amount of light. The correct statements are :
