NEET Practice Questions - Physics

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In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on θ for constructive interference at P between the ray BP and reflected ray OP IIT-JEE (Screening) 2003] (b) (c) (d) cos&=A4d sec9-cosθ = Nd sece- cos0-4/d A

In Young's double slit experiment with slit separation d, a monochromatic light of wavelength λ is used. The angular separation of the fringes is (a) d/λ (c) 22/d (e) λ/4d [Kerala PMT 2012] (b) (d) λ/d λ/2d

Two slits in Young's experiment have widths in the ratio 1: 25. The ratio of intensity at the maximum and minimum in the interference pattern, nX is AIPMT 2015] IS 121 49- 4 49 121 4

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is (a) radian AIPMT 20151 (b) radian 2 (c) radian (d) Tradiarn 4

Two beams of light will not give rise to an interference pattern, if (a) They are coherent (b) They have the same wavelength (c) They are linearly polarized perpendicular to each other (d) They are not monochromatic VITEEE 2008]

Young's experiment is performed in air and then performed in water, the fringe width RPMT 1997; Kerala PMT 2004; AFMC 2005; DCE 2009] (a) Will remain same (c) Will increase (b) Will decrease (d) Will be infinite

In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is the intensity at that point can be expressed by the expression MP PET 1998; MP PMT 2003] (c) 1 = A + B cos (d) I=A+Bcosp Where A and B depend upon the amplitudes of the two waves

A slit of width a is illuminated by white light. For red light (λ = 6500 ), the first minima is obtained at θ=30° Then the value of a will be [CPMT 2002; Kerala PET 2007] (a) 3250 Å (c) 1.24 microns (b) 6.5x104 mm (d) 2.6×10-4cm

Two waves originating from source s1 and S2 having zero phase difference and common wavelength λ will show completely destructive interference at a point P if (S1 P-S2 P) is (A) 5X (B) 2λ (B)3/4 (D) 117/2

The Brewster angle for the glass-air interface is 54.74°. If a ray of light going from air to glass strikes at an angle of incidence 45°, then the angle of refraction is (Hint : tan 5474-J2 ) (a) 60° (c) 25° J & K CET 2010] (b) 300 (d) 54.74°