Two plane mirrors are at an angle such that a ray incident on one mirror undergoes a total deviation of $240^o$ after two reflections. Which of the following statements is correct?
- AThe angle between the mirrors is $60^o$.
- BThe number of images formed by this system will be $5$,if an object is placed symmetrically between the mirrors.
- CThe number of images will be $5$ if an object is kept unsymmetrically between the mirrors.
- DAll of the above.
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When sunlight falls normally on Earth,a luminous flux density (illuminance) of $1.57 \times 10^5 \; lm/m^2$ is produced on Earth. If the distance of Earth from the Sun is $1.5 \times 10^8 \; km$,what is the total luminous flux emitted by the Sun?
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View SolutionMatch List $I$ with List $II$ and select the correct answer using the codes given below the lists:
List $I$ (Position of the object) List $II$ (Magnification) $(I)$ An object is placed at focus before a convex mirror $(A)$ Magnification is $-\infty$ $(II)$ An object is placed at centre of curvature before a concave mirror $(B)$ Magnification is $0.5$ $(III)$ An object is placed at focus before a concave mirror $(C)$ Magnification is $+1$ $(IV)$ An object is placed at centre of curvature before a convex mirror $(D)$ Magnification is $-1$ $(E)$ Magnification is $0.33$
| List $I$ (Position of the object) | List $II$ (Magnification) |
|---|---|
| $(I)$ An object is placed at focus before a convex mirror | $(A)$ Magnification is $-\infty$ |
| $(II)$ An object is placed at centre of curvature before a concave mirror | $(B)$ Magnification is $0.5$ |
| $(III)$ An object is placed at focus before a concave mirror | $(C)$ Magnification is $+1$ |
| $(IV)$ An object is placed at centre of curvature before a convex mirror | $(D)$ Magnification is $-1$ |
| $(E)$ Magnification is $0.33$ |
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View Solution$A$ convex lens forms an image of an object on a screen. The height of the image is $9 \, cm$. The lens is now displaced until an image is again obtained on the screen. The height of this image is $4 \, cm$. The distance between the object and the screen is $90 \, cm$.
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