Geometric Optics Grade 11

When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in the same medium. This phenomenon is called

• refraction

• reflection

• defraction

• scattering

The size of the image is always smaller than the object in

• plane mirror

• silver mirror

• concave mirror

• convex mirror

When a ray of light enters from denser medium to rare medium it bends

• away from normal

• towards normal

• perpendicular to normal

• parallel to normal

For a convex mirror the focal length is

• positive

• negative

• zero

• constant

The reflection by the rough surfaces is called

• regular reflection

• Specular reflection

• diffuse reflection

• irregular refraction

The quantity which does not changes during refraction is

• direction

• speed

• frequency

• wavelength

The critical angle of water when refracted angle is 90 ° and refractive index for water and air is 1.33 and 1 is

• 48.8 °

• 49.1 °

• 50 °

• 51 °

If an object is placed at the focus of a concave mirror, the image formed is:

• Real and inverted
  

• 
  Virtual and erect
  

• 
  At infinity
  

• 
  No image is formed
  

After reflection by the mirror, the ray parallel to the principal axis passes through the

• optical center

• vertex

• focal point

• core

A candle is placed in front of a concave mirror. The image produced by the mirror is:

• Real, inverted and magnified

• Real, inverted and demagnified

• Virtual, upright and magnified

• Virtual, upright and demagnified

• Real, upright and magnified