An object 4 cm tall is placed in front of a convex lens. It produces an image 3 cm tall. What is the magnification of the lens?
Which kind of a mirror is used to see the enlarged image of the object?
After reflection through a concave mirror, rays of light
The least number that is divisible by all the numbers from 1 to 10 (both inclusive) is
The lens which is used to correct myopia (shortsightedness) is
Which of the following numbers has terminating decimal expansion?
A concave mirror of focal length ‘f’ produces an image ‘n’ times farther than the object. If the image is real, then the distance of the object from the mirror is:
According to the new cartesian sign convention,
Which lens always forms a virtual image?
The power of a lens of focal length 50 cm is
After refraction through a rectangular glass slab the emergent ray is
Which one of the following materials cannot be used to make lens?
Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is
In order to get a diminished and virtual image, the object can be placed anywhere in front of a:
The combination of a convex lens of power +2D and a concave lens of power -2D, acts as a
The maximum image distance in case of a concave lens of focal length ‘f’ is :
The mirror used as rear view mirror is
Drop of water behaves likes a
The bending of light ray due to change in its speed is
An object is placed 60 cm in front of a concave mirror. The real image formed by the mirror is located 30 cm in front of the mirror. What is the object’s magnification?
What will happen when a ray enters from glass to air medium?
If the image formed by a concave mirror is observed to be virtual, erect and larger than the object then the position of the object will be
The distance at which an object should be placed from a thin convex lens of focal length 10 cm to obtain a virtual image of double of its size is
A big shinny spoon is a good example of
The concave mirrors are used in