NEET Physics: Mirrors and lenses Practice Questions

Correct answer: C — Virtual

A plane mirror always forms a virtual image behind the mirror.

Correct answer: B — Negative

Concave lenses are diverging lenses, and by sign convention, their focal length is negative.

Correct answer: D — At infinity

When an object is placed at infinity, the reflected rays are parallel to each other, and the image is formed at infinity.

Correct answer: B — Virtual and erect

A convex lens (converging lens) forms virtual images that are always erect and diminished, regardless of the object's position, provided the object is outside the focal point.

Correct answer: C — Virtual and erect

A convex lens (converging lens) can form virtual, erect, and diminished images, depending on the object's position.

Correct answer: B — Between the optical center and the near point

To obtain a virtual image (which is required for hypermetropia correction by a concave lens), the object must be placed anywhere between the optical center (O) and the focal point (F) of the concave lens. This setup always forms a virtual, erect, and magnified image.

Correct answer: B — Beyond the focus

A convex lens always forms an image that is virtual, erect, and diminished (smaller) when the object is placed between the optical center and the focus.

Correct answer: C — Infinite

A plane mirror is an ideal reflector. Since light reflects without deviation, its focal length is considered infinite.

Correct answer: C — Lens

Lenses, whether convex or concave, work by refracting (bending) light as it passes through the material, which is the basis for image formation.

Correct answer: A — Real and erect

When an object is placed between the pole (P) and the focus (F) of a concave mirror, the reflected rays diverge, resulting in an image that is virtual, erect, and magnified.

Correct answer: C — The angle of incidence is always equal to the angle of reflection.

The law of reflection states that the angle of incidence (angle between the incident ray and the normal) is equal to the angle of reflection (angle between the reflected ray and the normal).

Correct answer: C — Concave lens

A concave lens is a diverging lens because it causes parallel rays of light passing through it to spread out (diverge).

Correct answer: A — Mirror formula

The relationship involving object distance and image distance for mirrors is described by the mirror formula, 1/v + 1/u = 1/f (where f is the focal length).

Correct answer: B — 90 degrees

In reflection from a plane mirror, the angle of incidence equals the angle of reflection, meaning the angle between the incident ray and the reflected ray is 180 degrees (when considering the path difference), but focusing on the angle formed by the ray and the mirror surface, the relationship is governed by the law of reflection. For simplicity in introductory terms, the angles are supplementary.