Medium
State one practical use each for a convex mirror, a concave mirror, a convex lens, and a concave lens.
- AConvex mirror: Rear-view mirror; Concave mirror: Shaving mirror; Convex lens: Camera lens; Concave lens: Galilean telescope eyepiece.
- BConvex mirror: Security mirror; Concave mirror: Solar furnace; Convex lens: Magnifying glass; Concave lens: Myopia correction.
- CConvex mirror: Street light reflector; Concave mirror: Dentist mirror; Convex lens: Projector; Concave lens: Peephole.
- DConvex mirror: Makeup mirror; Concave mirror: Rear-view mirror; Convex lens: Microscope; Concave lens: Camera.
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Similar Questions
An object is placed at a distance of $100 \text{ cm}$ from a converging lens of focal length $40 \text{ cm}$. $(i)$ What is the nature of the image? (ii) What is the position of the image? A convex lens produces an inverted image magnified three times of an object placed at a distance of $15 \text{ cm}$ from it. Calculate the focal length of the lens.
Difficult
View SolutionWhen an object is placed $20 \text{ cm}$ from a concave mirror, a real image magnified three times is formed. Find:
$(a)$ The focal length of the mirror.
$(b)$ Where must the object be placed to give a virtual image three times the height of the object (in $\text{ cm}$)?
$(a)$ The focal length of the mirror.
$(b)$ Where must the object be placed to give a virtual image three times the height of the object (in $\text{ cm}$)?
Difficult
View Solution$A$ point object emits rays in all directions. Consider a ray emitted from the object that is parallel to the principal axis of the mirror. One of the points required to trace the reflected ray is the point of incidence itself,as shown in the figure. Select a point from the given figure through which the reflected ray passes.
Two big mirrors $A$ and $B$ are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror $A$ goes on increasing, but that in mirror $B$ remains the same.
Medium
View Solution$(a)$ Draw a ray diagram in each of the following cases to show the position and nature of the image formed when an object is placed:
$(i)$ Between the focus and the centre of curvature of a concave mirror.
$(ii)$ Between the focus and the pole of a concave mirror.
$(iii)$ Between the centre of curvature and infinity for a concave mirror.
$(b)$ Give mathematical formulae for determining the magnification produced by a spherical mirror. What does $m = -1$ signify? Identify the mirror that can produce it.
$(i)$ Between the focus and the centre of curvature of a concave mirror.
$(ii)$ Between the focus and the pole of a concave mirror.
$(iii)$ Between the centre of curvature and infinity for a concave mirror.
$(b)$ Give mathematical formulae for determining the magnification produced by a spherical mirror. What does $m = -1$ signify? Identify the mirror that can produce it.
Medium
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