Physics — Optics & Modern Physics for the NEET Exam — Florida candidates

Common failure modes

These are the patterns that cause most candidates to lose marks on this topic. Recognising them in advance is half the work.

• !Using the wrong sign convention in the mirror equation — NEET uses the New Cartesian sign convention (object always to the left, distances measured from the pole)
• !Confusing converging (concave) mirrors with converging (convex) lenses — their focal-length sign conventions differ
• !Forgetting that interference requires coherent sources — two independent sources cannot produce a stable interference pattern
• !Misapplying Einstein's photoelectric equation — using ν (frequency) where λ (wavelength) or hc/λ is needed
• !Forgetting the nuclear binding energy per nucleon trend — peaks around iron-56, not at the lightest or heaviest nuclei

Study tips

• 1Memorise the mirror and lens equations in the New Cartesian sign convention: 1/v + 1/u = 1/f (mirrors: v image, u object, f focal length; same form for thin lenses).
• 2For wave optics, know the conditions for constructive and destructive interference: path difference = nλ (constructive) and (n + ½)λ (destructive).
• 3Drill Young's double slit experiment: fringe width β = λD/d. NEET tests direct substitution into this formula.
• 4For Bohr model: memorise En = −13.6/n² eV for hydrogen. Energy-level transition questions are near-guaranteed.
• 5Semiconductor: know the difference between n-type (donor impurities, majority carriers are electrons) and p-type (acceptor impurities, majority carriers are holes). Zener diode as voltage regulator and solar cell are NCERT topics.
• 6For NCLEX-RN: Florida is a Compact state — a Florida licence allows practice in 40+ NLC member states without re-applying. Plan for the multistate licensure premium when budgeting.
• 7For internationally-educated nurses: CGFNS CES report (not VisaScreen alone) is required by the Florida Board. Allow 8–12 weeks for CES processing.
• 8For CDL: FL DHSMV waives the skills test for active-duty military with equivalent vehicle experience; bring DD-214 and CDL skills-test waiver form.

Sample NEET Physics — Optics & Modern Physics questions

These sample items mirror the format and difficulty of real NEET questions. Practice with thousands more on the free Koydo question bank.

1. 1

   An object is placed 30 cm in front of a concave mirror of focal length 10 cm. The image distance is:

   • A15 cm
   • B−15 cmCorrect
   • C20 cm
   • D−20 cm
   Why this answer?

   Using the mirror equation 1/v + 1/u = 1/f with New Cartesian convention: u = −30 cm (object in front of mirror), f = −10 cm (concave). 1/v = 1/f − 1/u = −1/10 − (−1/30) = −1/10 + 1/30 = −3/30 + 1/30 = −2/30. v = −15 cm. The image is 15 cm in front of the mirror (real).

2. 2

   In Young's double-slit experiment, fringe width is directly proportional to:

   • ADistance between the slits
   • BWavelength of lightCorrect
   • CSquare of the wavelength
   • DSquare root of the screen distance
   Why this answer?

   Fringe width β = λD/d. It is directly proportional to wavelength λ (for fixed D and d). Increasing wavelength increases fringe width; decreasing wavelength (or using blue light instead of red) decreases fringe width.

3. 3

   The energy of a photon of frequency ν is given by:

   • Ahν²
   • BhνCorrect
   • Ch/ν
   • Dν/h
   Why this answer?

   Planck's relation: E = hν, where h = 6.626 × 10⁻³⁴ J·s and ν is the frequency of the photon. Equivalently, E = hc/λ. This is the fundamental energy-frequency relationship in quantum mechanics.

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