Tag: reflection of light at curved surfaces

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Questions Related to reflection of light at curved surfaces

Multiple choice physics reflection of light at curved surfaces the mirror formula derivation of formula for curved mirrors mirror formula and magnification

Mark the incorrect statement regarding mirror formula.

  1. Values of known and unknown parameters can be used with their proper signs

  2. Sign of unknown parameter comes of its own after calculation

  3. Mirror formula is applicable for both concave and convex mirrors

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The values of known parameter should be used with their proper sign convention. No sign should be attached to the unknown parameter during calculation. Its sign will come of its own after calculation.

Multiple choice physics reflection of light at curved surfaces the mirror formula derivation of formula for curved mirrors mirror formula and magnification

The relation among u, v and f for a mirror is

  1. $f = uv/(u+v)$
  2. $v = fu/(u+f)$
  3. $u = fv/(f+v)$

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to mirror equation.

$\cfrac{1}{f} = \cfrac{1}{u}+ \cfrac{1}{v}$
$\cfrac{1}{f} = \cfrac{u+v}{uv}$
$f = \cfrac{uv}{u+v}$

Similarly,
$v = \cfrac{fu}{u-f}$
$u = \cfrac{fv}{v-f}$

Multiple choice physics reflection of light at curved surfaces the mirror formula derivation of formula for curved mirrors mirror formula and magnification

The relation among $u,v$ and $f$ for a mirror is:

  1. $f=uv(u+v)$
  2. $v=fu(u+f)$
  3. $u=fv(f+v)$

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

from mirror formula

              $\dfrac { 1 }{ v } +\dfrac { 1 }{ u } =\dfrac { 1 }{ f } $
              $\Rightarrow \quad \boxed { f=\dfrac { uv }{ u+v }  } $
and
          $1+\dfrac { v }{ u } =\dfrac { v }{ f } \Rightarrow \boxed { u=\dfrac { fv }{ f-v }  } $

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

Which is the wrong statement out of the following?

  1. A concave mirror can give a virtual image.

  2. A convex mirror can give a virtual image.

  3. A concave mirror can give a diminished virtual image.

  4. A convex mirror cannot give a real image.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The properties of image formed for different object distance are listed below:
Concave mirror:
1)u<f----virtual image , enlarged.
2)f,u,2f---Real, inverted, magnified.
3)u>2f----Real, inverted, diminished.
Convex mirror:
for any object distance virtual,errect and enlarged image.

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

The temperature in a spherical reflector type solar cooker is raised to more than $500^o C$ by :

  1. concentrating energy at one point by using a concave reflector

  2. proper insulation of the cooker

  3. concentrating energy at one point by using a covex reflector

  4. both (A) and (B)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The temperature in a spherical reflector type solar cooler is raided to more than $500^\circ C $ by concentrating energy at one point by using a concave reflector.