Question

The focal length of the plane mirror is
a. At infinity
b. Zero
c. Negative
d. None of these

The image formed by a plane mirror is
a. Real and erect
b. Real and inverted
c. Virtual and erect
d. Virtual and inverted

A concave mirror gives a virtual, erect and enlarged image of the object, the object is placed
a. At infinity
b. Between F and C
c. Between P and F
d. At F

In optics an object which has higher refractive index is called
a. Optically rarer
b. Optically denser
c. Optical density
d. Refractive index

The unit of power of the lens is
a. Metre
b. Centimeter
c. Dioptre
d. M-1

Answer 1

$\quad\bigstar{\underline{\boxed{\orange{\sf{Answer :- }}}}}$

❒ The focal length of the plane mirror is

a. At infinity

b. Zero

c. Negative

d. None of these

$\bold\pink{option \: A}$

$\underline{\underline{\textbf{\textsf{\purple{\: At \: infinity\:}}}}}$

❒ The image formed by a plane mirror is

a. Real and erect

b. Real and inverted

c. Virtual and erect

d. Virtual and inverted

$\bold\pink{option \: C}$

$\underline{\underline{\textbf{\textsf{\purple{\: Virtual \: and \: erect \:}}}}}$

❒ A concave mirror gives a virtual, erect and enlarged image of the object, the object is placed

a. At infinity

b. Between F and C

c. Between P and F

d. At F

$\bold\pink{option \: C}$

$\underline{\underline{\textbf{\textsf{\purple{\: Between \: P \: and \: F \:}}}}}$

❒ In optics an object which has higher refractive index is called

a. Optically rarer

b. Optically denser

c. Optical density

d. Refractive index

$\bold\pink{option \: B}$

$\underline{\underline{\textbf{\textsf{\purple{\: Optically \: denser \:}}}}}$

❒ The unit of power of the lens is

a. Metre

b. Centimeter

c. Dioptre

d. M-1

$\bold\pink{option \:C}$

$\underline{\underline{\textbf{\textsf{\purple{\: Dioptre \:}}}}}$

$\bold\red{Hope \: it \: is \: helpful}$

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