Optometry and Ophthalmology MCQ, Part-12

01. Hypermetropia causes

a. divergent squint
b. convergent squint✓
c. both of the above
d. none of the above

02. In retinoscopy using a plane mirror with working distance 1m, when the mirror is tilted to the right the shadow in the pupil moves to the left in

a. hypermetropia
b. myopia more than –1 D✓
c. emmetropia
d. myopia less than –1 D

03. Patients with high myopia (>6D) are at a higher risk of

a ) Retinal detachment
b) Macular degeneration
c) glaucoma
d) All of the above✓

04. The bending of a beam of light when it passes obliquely from one medium to another is known as _______.

1.reflection
2.refraction✓
3.dispersion
4.deviation

05. Ray of light passes without deviation, if pass through

1.optical centre
2.focus
3.centre of curvature✓
4.pole

06. Convex lens always gives a real image if the object is situated beyond _______.

1.optical centre
2.centre of curvature
3.focus✓
4.radius of curvature

07. Parallel rays of light entering a convex lens always converge to _______.

1.centre of curvature
2.the principal focus✓
3.optical centre
4.the focal plane

08. Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?

1.Between O and F
2.At F
3.At 2 F✓
4.At infinity

09. SI unit of the power of a lens is ___________.

1.dioptre✓
2.cm
3.metre
4.watt

10. 1 D is the power of the lens of focal length of ______ cm.

1.100✓
2.10
3.1/100
4.1/10

11. In a simple microscope lens used is __________.

1.biconvex✓
2.biconcave
3.plano convex
4.cylindrical

12. Reciprocal of focal length in metres is known as the ______ of a lens.

1.focus
2.power✓
3.power of accommodation
4.far point

13. A convex lens is called _________.

1.converging lens✓
2.diverging lens
3.both converging and diverging lens
4.refracting lens

14. A positive magnification greater than unity indicates _____________________.

1.real image
2.virtual image✓
3.neither real not virtual image
4.distorted image

15. The power of a convex lens of focal length 50 cm is ______.

1.+ 2D✓
2.+50D
3.+1/50 D
4.+0.5D

16. The focal length of a lens whose power is -1.5 D is _______.

1.-66.66 cm✓
2.-3/2 m
3.+66.66cm
4.-1.5 m

17. Real images formed by single convex lenses are always ________________.

1.on the same side of the lens as the object
2.inverted✓
3.erect
4.smaller than the object

18. An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.

1.virtual and enlarged
2.virtual and reduced in size
3.real and reduced in size
4.real and enlarged✓

19. A concave mirror give real image with same size if positioned at

A. Infinity
B. Optical centre
C. Focus point
D. Centre of curvature✓

20. The of AR coating is based on the property

A. Total internal reflection
B. Refraction
C. Diffraction
D. Interference✓

21. A standard size (1.2mm) pinhole may correct refractive error upto

A.1D
B. 3D✓
C. 10D
D. Any power

22. Types of visual acuity include all except

A. Minimum visible
B. Minimum separable
C. Maximum resolvable✓
D. Hyper acuity

23. When correcting hypermetropia, if Plus lens placed away from eye, the required power to correct will be

A. Lower✓
B. Higher
C. Same
D. Higher in case of high hypermetropia

Moving lens away from the eye increases effective plus power
In a hyperope, far point is behind eye, Moving lens forward moves its focal point forward.
So the Lens is further away from far point of eye, To match far point of eye, we need
longer focal length (lower power) plus lens.

24. Distometer is used for measuring

A. Visual acuity
B. Power of lens
C. Vertex distance✓
D. Contrast sensitivity

25. In accommodation, convexity of the lens

A. Increase
B. Decrease
C. No change
D. None

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