which of these is false for the plane mirror?
  • a. focal lenght is infinite
  • b. Power of the plane mirror is zero
  • c. Magnification produced is 1
  • d. None of these
Which mirror is used as rear-view mirror in vehicles?
  • a. convex
  • b. concave
  • c. plane
when an object is placed at infinity from the concave mirror,the image is formed at?
  • a. infinity
  • b. radius of curvature
  • c. focus
  • d. none of these
An object 5.0cm in length is placed at a distance of 20cm in front of a convex mirror of radius of Curvature 30cm. Find the position of the image?
  • a. 8.1cm
  • b. 8.6 cm
  • c. None of these
Find the nature of the image
  • a. Virtual, inverted
  • b. real inverted
  • c. virtual, erect
  • d. real, erect
Find the size of the image?
  • a. 7.1cm
  • b. 5cm
  • c. 2.2 cm
  • d. None of these
A concave mirror is a part of a sphere of radius 60cm. It's focal length is?
  • a. 60cm
  • b. 15cm
  • c. 30
  • d. infinity
A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located?
  • a. 30 cm
  • b. 3.3 cm
  • c. 33 cm
  • d. none of these
A ray of light is incident on a concave mirror. If it is parallel to the principal axis, the reflected ray will
  • pass through the pole
  • retrace its path
  • pass through the focus
  • pass through the center of curvature
If an incident ray passes through the center of curvature of a spherical mirror, the reflected ray will
  • be parallel to the principal axis
  • pass through the focus
  • retrace its path
  • pass through the pole
To get an image larger than the object, one can use
  • a convex mirror but not a concave mirror
  • a plane mirror
  • either a convex mirror or a concave mirror
  • a concave mirror but not a convex mirror
A mirror forms a virtual image of a real object.
  • it must be a concave mirror.
  • it may be any of the mirrors mentioned above
  • it must be a convex mirror.
  • it must be a plane mirror.
Light cannot travel in a vacuum.
  • True
  • False
A ray of light incident parallel to the principal axis of a spherical mirror retraces its path after reflection
  • True
  • False
A ray starting from the focus of a concave mirror becomes parallel to the principal axis after reflection.
  • True
  • False
The angle of incidence is the angle between
  • the normal to the surface and the incident ray.
  • the reflected ray and the surface of the mirror.
  • the incident ray and the surface of the mirror
  • the normal to the surface and reflected ray.
No particle can ever move at a speed greater than that of light in vacuum.
  • True
  • False
A ray of light goes from a medium of refractive index${{n}_{_{1}}}$ to a medium of refractive index ${{n}_{2}}$. the angle of incidence is $i$ and the angle of refraction is $r$. Then, $\frac{sin i}{sin r}$ is equal to
  • $\frac{n_2}{n_1}$
  • $\frac{n_1}{n_2}$
  • ${{n}_{2}}$
  • ${{n}_{1}}$
A lens has a power of $+0.5 D$. it is
  • a concave lens of focal length 2m
  • a convex lens of focal length 2m
  • a convex lens of focal length 5cm
  • a concave lens of focal length 5cm
The value of $f$ and $u$ for a concave lens are always negative by convention.
  • True
  • False
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0