When a glass slab is introduced in the path of a light ray the number of times the light ray undergoes refraction are ……………….
A) 2 times
B) 3 times
C) 4 times
D) 1 time
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If i and r be the angles of incidence and refraction respectively, when the light ray travels from glass to air, then
Correct option is C) i < r
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The light ray that falls perpendicular to one side of the glass slab surface comes out……………………..
B) without any deviation
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Raju is doing an experiment with the glass slab. He focussed the light towards the glass slab at an angle 30°.
Correct option is A) 30°
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A ray of light falls normally on a glass slab. What is the angle of emergence ?
Correct option is A) 0°
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A ray of light falls obliquely on a glass slab. What is the angle of emergence ?
C) Equal to incident angle
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When a ray of light travels through glass slab. Which of the following is not true when it is incidentobliquely ?
D) Incident ray and emergent ray are not along the same straight line.
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Ramu placed a rectangular glass slab over printed letters. The letters appears while ………………. viewing through a glass slab.
B) nearer as its original position
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If the thickness’ of the glass slab increases then the refractive index of the glass slab …………………
C) remains same
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A glass slab is placed in the path of a beam of convergent light. The point of convergence of light
(A) moves towards the glass slab.
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Let \( \vec{a}, \vec{b}, \vec{c} \) be unit vectors such that \( \vec{a}+\vec{b}+\vec{c}=\overrightarrow{0} \). Which one of the following is correct ? [IIT-2007] (a) \( \vec{a} \times \vec{b}=\vec{b} \times \vec{c}=\vec{c} \times \vec{a}=\overrightarrow{0} \) (b) \( \overrightarrow{ a } \times \overrightarrow{ b }=\overrightarrow{ b } \times \overrightarrow{ c }=\overrightarrow{ c } \times \overrightarrow{ a } \neq \overrightarrow{0} \) (c) \( \overrightarrow{ a } \times \overrightarrow{ b }=\overrightarrow{ b } \times \overrightarrow{ c }=\overrightarrow{ a } \times \overrightarrow{ c } \neq \overrightarrow{0} \) (d) \( \vec{a} \times \vec{b}, \vec{b} \times \vec{c}, \vec{c} \times \vec{a} \) are mutually \( \perp \)
Given that \(\vec a, \vec b\) and \(\vec c\)are unit vectors. i.e., |\(\vec a\)| = |\(\vec b\)| = |\(\vec c\)| = 1 And \(\vec a\) + \(\vec b\) + \(\vec c\) = \(\vec 0\) Then \((\vec a+\vec b+\vec c).(\vec a+\vec b+\vec c)=\vec 0.\vec...
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