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Answer the following questions : Does ...

Answer the following questions :
Does the apparent depth of a tank of water change if viewed obliquely ? If so, does the apparent depth increase or decrease ?

Text Solution

Verified by Experts

(a) Yes, when rays incident on a plane mirror or a convex mirror are tending to converge to a point behind the mirror, they are relflected to a point on a screen in front of the mirror. Hence a real image is formed (when the object is virtual ).
(b) No, there is no contradiction. Eye lens is convergent. It forms a real image of the virtual object (i.e., the virtual image being seen ) on the retina.
( c) As fisherman is ni air, light travels from rarer to denser medium. It bends towards the normal, appearing to come from a larger distance. Therefore, to the diver under water. fisherman looks taller.
(d) Yes, the apparent depth decreases further, when water tank is viewed obliquely compared to the depth when seen near normally.
(e) As `mu = (1)/(sin C) :. sin C = (1)/(mu)`
As refractive index of diamond is much greater than that of ordinary glass, critical angle `C` for diamond is much smaller `(~~ 24^(@))` as compared to that for glass `(~~ 42^(@))`. A skilled diamond cutter exploits the large range of angles of incidence of light `(24^(@)` to `90^(@))` to ensure that light entering the diamond suffers multiple total internal reflection within the diamond. This produces sparking effect in the diamond.
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Answer the following questions : (a) You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances ? Explain. (b) A virtual image, we always say, cannot be caught on a screen. Yet when we see a virtual image, we bring it to screen i.e. retine of our eye. Is there a contradiction ? ( c) A diver under water looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter than what he actually is ? (d) Does the apparent depth of a tank of water change if viewed obliquely ? If so, does the apparent depth increase or decrease ? ( e) The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter ?

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Knowledge Check

  • A : The apparent depth of a tank of water decreases if viewed obliquely. R : Real depth decreases if viewed obliquely.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
    C
    If Assertion is true statement but Reason is false, then mark (3).
    D
    If both Assertion and Reason are false statements, then mark (4).

  • In which of the following reactions does the heat change represent the heat of formation of water

    A
    `2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l),DeltaH=-116 kcal`
    B
    `H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l),DeltaH=-58 kcal`
    C
    `H^(+)(aq.)+OH^(-)(aq.)rarr2H_(2)O(l), DeltaH=-13.7 kcal`
    D
    `C_(2)H_(2)(g)+2(1)/(2)O_(2)(g)rarr2CO_(2)(g)+H_(2)O(l), DeltaH=-310 kcal`

  • In which of the following reaction does the heat change represent the heat of formation of water ?

    A
    `2H_(2(g))+O_(2(g)) rarr 2H_(2)O_((l)),Delta H = 116 Kcal`
    B
    `H_(2(g))+(1)/(2)O_(2(g)) rarr H_(2)O_((l)),Delta H = -6.8 Kcal`
    C
    `H_((aq))^(+)+OH_((aq))^(-) rarr H_(2)O_((l)),Delta H = 13.7 Kcal`
    D
    `C_(2)H_(2(g)) +2O_(2(g))+H_(2)O_((l)),Delta H = 310 Kcal`