When a concave mirror of focal length f is immersed in water, its focal length becomes f', then: 1. f'=f 2.  f'<f 3.  f'>f 4.  The information is insufficient to predict

Subtopic:  Reflection at Spherical Surface |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Two convex lenses of focal length X and Y are placed parallel to each other. An object at infinity from the first lens forms its image at infinity from the second lens. The separation between the two lenses should be:

 1 X + Y 2 $$\frac{X + Y}{2}$$ 3 X - Y 4 $$\frac{X - Y}{2}$$
Subtopic:  Lenses |
68%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A plane mirror is placed at the bottom of a fish tank filled with water of refractive index $\frac{4}{3}$. The fish is at a height 10 cm above the plane mirror. An observer O is vertically above the fish outside water. The apparent distance between the fish and its image is:

1. 15 cm

2. 30 cm

3. 35 cm

4. 45 cm

Subtopic:  Refraction at Plane Surface |
63%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If $$C_1,~C_2 ~\mathrm{and}~C_3$$ are the critical angle of glass-air interface for red, violet and yellow color, then:

 1 $$C_3>C_2>C_1$$ 2 $$C_1>C_2>C_3$$ 3 $$C_1=C_2=C_3$$ 4 $$C_1>C_3>C_2$$
Subtopic:  Total Internal Reflection |
67%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

An object is placed 20 cm in front of a concave mirror of a radius of curvature 10 cm. The position of the image from the pole of the mirror is:

1. 7.67 cm

2. 6.67 cm

3. 8.67 cm

4. 9.67 cm

Subtopic:  Reflection at Spherical Surface |
91%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

When a ray of light falls on a given plate at an angle of incidence $$60^{\circ}$$, the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is:

 1 $$\frac{\sqrt{3}}{2}$$ 2 $$1.5$$ 3 $$1.732$$ 4 $$2$$
Subtopic:  Refraction at Plane Surface |
76%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A thin rod of length $$\frac{f}{3}$$ lies along the axis of a concave mirror of focal length $$f$$. One end of its magnified, real image touches an end of the rod. The length of the image is:

1. $$f$$

2. $$\frac{f}{2}$$

3. $$2f$$

4. $$\frac{f}{4}$$

Subtopic:  Reflection at Spherical Surface |
58%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A thin equiconvex lens of power P is cut into three parts A, B, and C as shown in the figure. If P1, P2, and P3 are powers of the three parts respectively, then:

 1 $$P_1=P_2=P_3$$ 2 $$P_1>P_2=P_3$$ 3 \(P_1
Subtopic:  Lenses |
69%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A medium shows relation between i and r as shown. If the speed of light in the medium is nc then the value of n is:

1. 1.5

2. 2

3. 2–1

4. 3–1/2

Subtopic:  Refraction at Plane Surface |
76%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use will be:

 1 Convex, +2.25 D 2 Concave, - 0.25 D 3 Concave, - 0.2 D 4 Convex, + 0.15 D

Subtopic:  Human Eye |
77%
From NCERT
NEET - 2016
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints