In a concave mirror, the image size depends upon:
In the normal human eye, the image is formed:
When a light ray enters from a denser medium to a rarer medium, it bends:
In a compound microscope, as compared to an objective, the eyepiece lens has a focal length:
When the angle of refraction is 90° and the refractive index for water is 1.33, the critical angle is:
To view dim stars, we use:
The human eye acts like a:
A magnifying glass forms an enlarged:
The entire light is reflected into the same denser medium, which is called total:
In the optic fiber, the core is made of glass or plastic of relatively:
magnifying glass is also called:
The defect in which the image is formed beyond the retina is called:
The short-sightedness can be corrected by using:
Lenses form images through:
To illuminate the inaccessible places in the tooth, dentists use: