NCERT Physics and Science Practice Answers Review

Vocabulary-style flashcards based on the numerical results, rules, and image characteristics provided in the NCERT chapter answer keys.

$$m = 1$$

Indicates that the image formed by a plane mirror is of the same size as the object, where the positive sign indicates the image is virtual and erect.

Concave lens

A type of lens associated with a negative focal length (e.g., $-0.50\,m$) and negative power (e.g., $-1.25\,D$).

Converging lens

A lens, such as a convex lens, characterized by a positive focal length (e.g., $+0.67\,m$) and positive power (e.g., $+3.0\,D$).

Right-hand thumb rule

One of the two specific rules identified in Chapter 12 for determining directions in electromagnetism.

Fleming’s left-hand rule

A rule identified in Chapter 12 alongside the Right-hand thumb rule for physical principles.

Resistivity of alloys

Specifically described as being "High" in the context of electrical properties in Chapter 11.

Real, inverted image

An image described as being produced at $16.7\,cm$ from a lens on the other side or $54\,cm$ on the object side of a mirror.

Virtual, erect image

An image type formed behind a mirror (e.g., $6.0\,cm$ or $8.6\,cm$ behind) or when magnification has a positive sign.

Reduced image

An image description where the size is smaller than the object, such as a $3.3\,cm$ image or a $2.2\,cm$ image.

Magnified image

An image description provided for an object distance where the image size is enlarged, such as a $14\,cm$ image.