A short object of length L is placed along the principal axis of a concave mirror slightly away from the focus of the mirror (u ≈ f). What will be the length of the image? (symbols carry their usual meanings)
Correct answer is B
Calculation:
From the mirror formula:
1/f = 1/u + 1/v => v = fu/(u - f).
The magnification (M) is:
M = -v/u = -(fu/(u - f))/u = -f/(u - f).
The length of the image is given by:
Limage = |M| × L => Limage = (f/(u - f)) × L.
Now, simplifying further:
Limage = (f2/((u - f)2)) × L.
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150 Mins English English150 Questions150 Marks150 Mins English English150 Questions150 Marks150 Mins EnglishA short object of length L is placed along the principal axis of a concave mirror slightly away from the focus of the mirror (u ≈ f). What will be the length of the image? (symbols carry their usual meanings)
Where should the object be placed around the concave mirror to ensure that the size of the image is the same as the size of the object?
The centre of curvature of a concave mirror lies _______ the mirror, whereas it lies _______ the mirror for a convex mirror.
The centre of curvature of a concave mirror lies ________ the mirror, whereas it lies _______ the mirror for a convex mirror.
Which mirror has negative focal length?
Which mirror is used for shaving purpose?
Which type of mirrors are commonly used in torches, searchlights and vehicle headlights to get powerful parallel beams of light?
Identify the correct statement(s) with respect to the reflection of light by a spherical mirror from among the following.
(A) A convex mirror can only form real and inverted images.
(B) A concave mirror can form real, inverted and virtual, erect images.
(C) Images formed by convex mirrors are either diminished, same size or enlarged depending on the position of object.
(D) Images formed by concave mirrors are either diminished, same size or enlarged
Suggested Test Series
Suggested Test Series
A short object of length L is placed along the principal axis of a concave mirror slightly away from the focus of the mirror (u ≈ f). What will be the length of the image? (symbols carry their usual meanings)
Where should the object be placed around the concave mirror to ensure that the size of the image is the same as the size of the object?
The centre of curvature of a concave mirror lies _______ the mirror, whereas it lies _______ the mirror for a convex mirror.
The centre of curvature of a concave mirror lies ________ the mirror, whereas it lies _______ the mirror for a convex mirror.
Which mirror has negative focal length?
Which mirror is used for shaving purpose?
Which type of mirrors are commonly used in torches, searchlights and vehicle headlights to get powerful parallel beams of light?
Identify the correct statement(s) with respect to the reflection of light by a spherical mirror from among the following.
(A) A convex mirror can only form real and inverted images.
(B) A concave mirror can form real, inverted and virtual, erect images.
(C) Images formed by convex mirrors are either diminished, same size or enlarged depending on the position of object.
(D) Images formed by concave mirrors are either diminished, same size or enlarged
