Physics

Ray Optics and Mirrors

141 Questions

Ray optics covers the principles of light reflection and refraction through mirrors and lenses. The questions focus on focal length, magnification, and image formation. This physics topic is highly relevant for exams requiring science aptitude.

Concave mirror imagesConvex lens formulasFocal length calculationsMagnification ratiosImage distance

Ray Optics and Mirrors Questions

Multiple choice

Which of the following parameters is not used in lens formula?

  1. Distance of object

  2. Distance of image

  3. Focal length of lens

  4. Height of image

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

No, the height of image is not shown in the lens formula, it is the relation between distance of object, distance of image and focal length for a lens.

Multiple choice

In case of hypermetropia

  1. the image of a distant object is formed in front of the retina

  2. the image of a near object is formed behind the retina

  3. a concave lens should be used for correction

  4. a convex lens cannot be used for correction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hypermetropia, or farsightedness, occurs when the eyeball is too short or the lens has insufficient converging power. This causes the image of nearby objects to be focused behind the retina rather than on it.

Multiple choice

Where should we place the object so as to get an enlarged, virtual and erect image using a convex lens?

  1. The object is placed beyond 2F.

  2. The object is placed at infinity.

  3. The object is placed at 2F.

  4. The object is placed between F and 2F.

  5. The object is placed between the pole (P) and F.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

When the object is placed between the pole (P) and F, the image will be formed on the same side of the object. The image will be virtual, erect and magnified.

Multiple choice evs magic with mirrors introduction to light and mirror image formation by plane mirror light : reflection and refraction from plane surface

A real image of a distant object is formed by a plano-convex lens on its principal axis. Spherical aberration

  1. is absent

  2. is smaller if the curved surface of the lens faces the object

  3. is smaller if the place surface of the lens faces the object

  4. is the same whichever side of the lens faces the object
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a plano-convex lens, spherical aberration is minimized when the curved surface faces the side with the smaller conjugate distance (the side with the more divergent rays). For a distant object, this means the curved surface should face the object.

Multiple choice physics lens technical terms related to lens terms related to lenses introduction to lenses and its types

The value of the focal length of the lens is equal to the value of the image distance when the rays are

  1. Passing through the optic centre

  2. Parallel to the principal axis

  3. Passing throught he focus

  4. Over the mirror
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the object is placed at infinity, i.e., when the rays are parallel to the principal axis, the value of focal length is equal to the value of the image distance.

i.e., object distance , $u=\infty$
From lens formula,

$\dfrac 1f=\dfrac 1u+\dfrac 1v\\\implies \dfrac 1f=\dfrac 1\infty+\dfrac 1v\\\implies f=v$
i.e., image distance is equal to focal length of the lens.